Vieri does it best and you know it.
Pires does the finger swagging too. Vieri does his 'shut the fuck up' celebration. I heard that an African player does a somersault. Anyone know if there's any truth to this as I haven't experienced it?
EDIT: What I'm really looking for, though, is a celebration where you jump the ad-board and celebrate with the fans. They could incorporate it as a sort of mini-game. Maybe a jump meter for the ad boards relying on quick reflexes so you don't break your ankle embarrassingly when landing much like our Argentinian league friends. Also, "Watch that Knife!" would feature when celebrating in the crowd. You have to be wary of Swiss Army knife wielding maniacs or your season (and probably your life) is over.