Arsenal's spectacular collapse at Chelsea descended into farce when Kieran Gibbs was mistakenly red-carded by referee Andre Marriner, instead of Alex Oxlade-Chamberlain.
Samuel Eto'o and André Schürrle put Chelsea into a 2-0 lead inside seven minutes before Oxlade-Chamberlain dived to divert Eden Hazard's effort - which was going wide - with his hand.
Marriner can expect a demotion, at the very least, next week
Marriner did not immediately point to the spot, but eventually gave a penalty in the 15th minute and, amid much confusion, flourished the red card in front of an incredulous Gibbs.
Chelsea v Arsenal
FBL-ENG-PR-CHELSEA-ARSENAL(01 of26)
Arsenal's English defender Kieran Gibbs (L) is sent off by referee Andre Marriner (2R) during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(02 of26)
LONDON, ENGLAND - MARCH 22: A dejected Lukas Podolski of Arsenal looks to the ground during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Shaun Botterill/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(03 of26)
LONDON, ENGLAND - MARCH 22: Referee Andre Marriner shows Kieran Gibbs of Arsenal a red card during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Shaun Botterill/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(04 of26)
LONDON, ENGLAND - MARCH 22: Referee Andre Marriner shows Kieran Gibbs of Arsenal a red card during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Shaun Botterill/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(05 of26)
LONDON, ENGLAND - MARCH 22: Referee Andre Marriner shows Kieran Gibbs of Arsenal a red card during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Shaun Botterill/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(06 of26)
Arsenal's English defender Kieran Gibbs (L) reacts after being sent off by referee Andre Marriner during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(07 of26)
Arsenal's English defender Kieran Gibbs reacts after being sent off by referee Andre Marriner during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(08 of26)
LONDON, ENGLAND - MARCH 22: A dejected Per Mertesacker, Santi Cazorla and Laurent Koscielny of Arsenal after conceding the second goal during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Shaun Botterill/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(09 of26)
Arsenal's English defender Kieran Gibbs (L) is sent off by referee Andre Marriner (C) during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(10 of26)
LONDON, ENGLAND - MARCH 22: A dejected Lukas Podolski of Arsenal looks on during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Shaun Botterill/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(11 of26)
Chelsea's German striker Andre Schurrle (C) is hugged by Chelsea's Serbian midfielder Nemanja Matic (L) as he celebrates scoring their second goal during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(12 of26)
LONDON, ENGLAND - MARCH 22: Samuel Eto'o of Chelsea waves as he leaves the field injured during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(13 of26)
Chelsea's German striker Andre Schurrle (C) is hugged by Chelsea's Serbian midfielder Nemanja Matic (L) as he celebrates scoring their second goal during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(14 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with Nemanja Matic, Eden Hazard and Samuel Eto'o of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(15 of26)
Chelsea's German striker Andre Schurrle celebrates scoring their second goal during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(16 of26)
Chelsea's Belgian midfielder Eden Hazard (L) jumps on as Chelsea players crowd Chelsea's German striker Andre Schurrle (R back) as they celebrate their team's second goal during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / BEN STANSALLRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(17 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with Nemanja Matic and Samuel Eto'o of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(18 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with Nemanja Matic and Samuel Eto'o of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(19 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with Nemanja Matic, Eden Hazard, Samuel Eto'o, Oscar, Branislav Ivanovic of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(20 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with, David Luiz, Samuel Eto'o, Oscar, Branislav Ivanovic of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(21 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with, David Luiz, Samuel Eto'o, Oscar, Branislav Ivanovic of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(22 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with, David Luiz, Samuel Eto'o, Oscar, Branislav Ivanovic of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
Chelsea v Arsenal - Premier League(23 of26)
LONDON, ENGLAND - MARCH 22: Andre Schurrle of Chelsea celebrates scoring his second goal with Nemanja Matic, Eden Hazard, David Luiz, Samuel Eto'o, Oscar, Branislav Ivanovic of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on March 22, 2014 in London, England. (Photo by Richard Heathcote/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(24 of26)
Chelsea's Belgian midfielder Eden Hazard scores his teams third goal from the penalty spot during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(25 of26)
Chelsea's Belgian midfielder Eden Hazard (L) scores his teams third goal from the penalty spot during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / GLYN KIRKRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read GLYN KIRK/AFP/Getty Images) (credit:Getty Images)
FBL-ENG-PR-CHELSEA-ARSENAL(26 of26)
Chelsea players crowd Chelsea's German striker Andre Schurrle (R back) as they celebrate their team's second goal during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on March 22, 2014. AFP PHOTO / BEN STANSALLRESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:Getty Images)
However, Oxlade-Chamberlain was filmed approaching the referee and appeared to say: "Ref, it was me." Hazard converted the spot-kick and Oscar extended Chelsea's lead to four in the 42nd minute.
Oxlade-Chamberlain was substituted at half-time.
"You've sent me off?!"
In 2008, Aalborg's Joey Beauchamp was mistaken for Michael Jakobsen in their goalless Champions League draw at Celtic and received his marching orders.
And earlier this term, Preston North End's Neil Kilkenny was dismissed even though teammate Joe Garner was involved in an altercation with Port Vale's Anthony Griffith.
Chelsea eventually won 6-0 on Saturday, equalling Wenger's worst ever defeat in his 1,000th game in charge of Arsenal.