Dwight Yoakam did a fine job as the bad guy in Sling Blade. I haven't seen him in anything else.

I've seen Lyle Lovett in a few small roles, and I thought he did pretty well.

I think Paul Simon is absolutely brilliant when he does comedy. SNL recently reran the bit in which he dressed in a turkey costume—see here: http://www.youtube.com/watch?v=Rxe8vlhdKYM. One Trick Pony was underrated. It wasn't all comedy, but there were a few very funny moments.