24. Kevin Costner
Worst Performances: Waterworld (1995), The Postman (1997), 3000 Miles To Graceland (2001), Rumor Has It (2005), Mr. Brooks (2007)
Growing up, we always tried to convince our mothers that Kevin Costner was lamer than Tiny Tim, an opinion that never failed to put us on their shit-lists. And then the atrocious box office catastrophe Waterworld, in which Costner's character drank his own urine (seriously), followed by the ridiculous The Postman and further descents into mediocrity. At the center of them all is the overachieving Costner, an ordinary-at-best talent who's been able to ride the coattails of a few good movies (Dances With Wolves, Field Of Dreams) all the way to the bank. Not even our mothers can deny that now.