It's true that an animated version of the deluge at the beginning of Ovid's Metamorphoses doesn't sound like your usual YouTube fun, but this made me laugh. It's a weird mix of quoting directly from Ovid (in translation) and explaining in plainer English. It's mostly static at the beginning because the guy who made it was in high school and was rather busy. This doesn't limit the quality much, though, and it's generally funny.
Watch out for Man. His first actions/words made me cry with laughter for the rest of the video.
Click to view
If you like that, I should post up the song version of Catullus 5, sung in the original Latin...