Saturday night saw Serie A witness its Roy Carroll moment.
In the biggest game of the season between AC Milan and Juventus, linesman Roberto Romagnoli committed an astonishing error when he denied the Milanese side a 2-0 lead.
Sulley Muntari prodded the ball a yard over the line from a corner, which was clawed out by Juve 'keeper Gianluigi Buffon, seemingly in vain. However, Romagnoli, stood directly parallel with the goalline, inexplicably didn't give the goal.
Just as the majority of Italy began to holler Calciopoli, Romagnoli then disallowed an Alessandro Matri goal when the substitute striker was shown to be onside. Matri later did equaliser for the bianconeri, prompting Milan to brand the occasion a "falsified match".
And Muntari has scored! Or has he?
Carroll, of course, dropped a sensational clanger seven years ago when Tottenham Hotspur's Pedro Mendes hit a speculative effort from 40 yards out which the Manchester United keeper fumbled over the line.
The Northern Irishman clawed the ball back desperately, and linesman Rob Lewis didn't give the goal that - "scored" in injury time - would surely have given Spurs their first win at Old Trafford since 1989. They are still waiting to take three points from the Theatre of Dreams.
So here are just some of the most extraordinary officialdom blunders in English football: