
From Wikipedia:
The atmosphere produced by the fans has, however, been criticised at times. In 2000, comments made about sections of the Old Trafford crowd by the then-club captain Roy Keane, claiming some fans could not "spell football, never mind understand it" led to them being dubbed the "prawn sandwich brigade"FULL DISCLOSURE: I am a Manchester City supporter, so United fans can suck it.

the Professor at the recent Man United vs Man City match.