Actually Ronnie, you're right. Jerry Lewis immediately comes to mind. He's turned in some quite impressive dramatic work over the years. On the other side of the coin is DeNiro. I'm not even gonna get into the cartoonish peformances in MEET THE FOCKERS, etc...but if you go back to 1988's MIDNIGHT RUN, you can see a real talent for comedy.

Buddy movie/Mob movie ??

Damn you RonnieRocket!!