5. Jim Carrey
You can describe Jim Carrey's performance in 99.99% of his films as 'man who makes crazy expression, laughs wildly and goes so over the top it makes your skin crawl.' The other 0.01% is Eternal Sunshine of the Spotless Mind and The Truman Show. Carrey's performance in the Charlie Kaufman scripted Eternal Sunshine of the Spotless Mind is unbelievable, and one of the best performances over the last decade, and much like Adam Sandler, there was some hope that Carrey would pursue similar, more abstract projects in its wake, but sadly no. He appeared in just one film in 2005 , which was the laugh-free Fun with Dick and Jane, and none in 2006 before deciding to make a comeback in 2007, with the unspeakably awful The Number 23. Since then, Carrey's given us Horton Hears a Who, Yes Man, I Love You Philip Morris, A Christmas Carol and Mr. Popper's Penguins. Carrey decided to take a risk, which has to be admired, but it backfired, and back to nauseating attempts at being funny we go. The actor certainly has the potential to be funny - he was remarkable as Count Olaf in A Series of Unfortunate Events and was a fairly entertaining presence in Bruce Almighty, but once you've seen The Truman Show and Eternal Sunshine of the Spotless mind, it baffles as to how he can consciously go back to making the blithering rubbish he does. Granted, there aren't many scripts quite as wonderful as Eternal Sunshine of the Spotless Mind knocking about, but Carrey has to try something daring, or he will just rot and waste talking to CGI penguins. Now that he is getting into his fifties, he may want to try something new, even if recent evidence proves otherwise, but something half as good as Eternal Sunshine is better than the stuff he's putting out now.