Sir Alex Ferguson's 1,500th and final match in charge as Manchester United manager ended in enthralling fashion as West Bromwich Albion fought back to draw 5-5 at the Hawthorns.
Romelu Lukaku hit a hat-trick as Baggies rallied from 2-5 down to score three goals in five minutes for a sensational draw.
Ferguson was granted a guard of honour by both teams before waving to the travelling United fans, who brought a nostalgic 70s vibrance to the terraces, serenading the Scot's successor David Moyes to the tune of Slade.
Shinji Kagawa opened the scoring before a Martin Olsson own goal and Alex Büttner struck to extend the Barclays Premier League champions' lead.
James Morrison reduced United's lead and substitute Romelu Lukaku made it 2-3 shortly after the break, with a helping hand from United goalkeeper Anders Lindegaard.
However Robin van Persie quickly pounced for his 30th goal of the season and Javier Hernández regained United's three-goal lead.
Yet United expertly imitated their hosts' porous defending as two goals from Lukaku and Youssouf Mulumbu in as many minutes made it 4-5. The troublesome Lukaku then bundled the ball in to make it 5-5 for his hat-trick.