re: I'm sure this has been covered but what's the greatest single acting performance

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Jim Carrey, in the Truman show. Or man on the moon.

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That was a great performance and he deserved an Oscar nomination at least, and it's also one of my favorite movies, but I can think of at least 40 performances better than it on te top if my head. Carrey really did prove himself as a great actor in that film and simply not comic relief.