“Do any fanbases regularly sing in praise of a player who never actually played for them?” tweets Andy Brook. “Possibly due to scoring a vital goal against a rival or something similar?”
The key phrase here is probably “in praise”. A number of you mentioned schadenfreude-fuelled chanting – Steven Gerrard’s slip, Patrick Vieira giving Ryan Giggs the ball, that kind of thing – but you could write a book on those and they aren’t really in the spirit of the question. So let’s focus on the positives.