MasterBlaster76
ICC Chairman
One actor who normally plays comedies is Jim Carrey.
I really liked the serious portrayal of his character in "Eternal Sunshine of a Spotless Mind".
I haven't seen that one, but I liked him in The Truman Show - as you said, he is primarily a (physical) comedy actor - but films like The Truman Show demonstrate he can actually 'act', as opposed to just act like a buffoon - not that his comedies aren't funny, they are; it's just they're not always entirely believable.