Beating a dead horse

Despite a previous post of mine, I honestly don't have anything against Marcel Marceau (I do hate mimes though; they rank lower than clowns in my book and there's only two clowns I like, Bozo and Krusty), but this is a pretty funny joke, as told by David Letterman on his Late Show:
"Marcel Marceau died. He mimed, 'Call an ambulance!' By the time they figured out, it was too late. Finally, after all these years, he really is trapped in a box."