31. Vin Diesel
Worst Performances: The Chronicles Of Riddick (2004), The Pacifier (2005), Babylon A.D. (2008)
If you've never seen Sidney Lumet's Find Me Guilty, give it a look some day, because it's the only time you'll ever see Vin Diesel actually act. And, honestly, he's not half-bad in it, which makes one wonder what could've been if he'd broken out of the action-star box at some point, rather than cash lazy franchise checks (The Fast & The Furious movies, the awful sequel The Chronicles Of Riddick) and stifle himself. One gets the feeling that he'd agree with this sentiment; no actor looks as uninterested in his own performances while in character as Diesel.