My favorite comedy clown is Cookie from the old Bozo show. He's so cute, like if a Shih Tzu could be a clown. My favorite evil clown is Kefka from FFVI. And Dr. Rockso, favorite Rock 'n Roll clown.

My least favorite? Joe Pesci. He just doesn't amuse me.

If you like clowns and webcomics, which you must by being in this thread, I recommend Clown Corps. I discovered it about a month ago when I was reading a different work by the artist. It's about a clown special police force, they use pies, balloons and confetti cannons as weapons. And, they manage to still be cool. It's funny, has shonen-style battles, and lots of interesting characters!