Worst Performances: The Great White Hype (1996), Deep Blue Sea (1999), The Man (2005), Snakes On A Plane (2006), Cleaner (2007), The Spirit (2008)

Forget the old adage—you can have too much of a good thing. Back in the day, Sam Jackson was one of the coolest actors in the game, the type of guy we loved seeing ham it up and chew scenery in movies. But then he just wouldn't stop, popping up in more films than Morgan Freeman and rapidly diluting his once-commendable filmography. It used to be a coup to have Sammy J in your movies; now it's almost a prerequisite. And with every new role, he seems less and less interested, no doubt performing takes with dollar signs frolicking in his head.