I love Best in Show! I think Fred Willard is the best, funniest thing in that movie and it is a hilarious movie with the great Christopher Guest comedy "rep company" at top form.
But another thing I haven't seen menrioned (and most people might not know) - a few years ago, PBS ran a really good concert performance of the musical "Show Boat," and Fred Willard played Captain Andy. I loved him in that, he just had a real warmth and charm and got to play more drama than usual. I loved that production all around.