And aren't clowns supposed to be funny, even when most of them aren't?
It depends on how you are defining tragedy. I've seen lots of comic things that aren't funny, in that they didn't make me laugh out loud. But they were still incredible affecting comedy.
And besides, a mime isn't a clown.
Not to belabor this, but he performed in the persona of a character named "Bip the Clown."