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While we were riding the shuttle bus to a screening at Sundance, we fell into conversation with comedian Taylor Negron, whom you undoubtedly remember from his iconic roles as the mailman in Better Off Dead and the pizza delivery guy in Fast Times at Ridgemont High. Negron was at the festival for the documentary The Aristocrats (one of the hottest tickets of the week, btw), which features comedians telling their renditions of the dirtiest joke in the world, and claimed that his was the filthiest version in the movie. We prodded him to tell it, but he demurred, claiming that the other people on the bus didn't want to hear about "fucking your sister in the ass and fisting dead babies." Despite our assertion that it would depend on the size of the fist, he wouldn't budge, and our stop arrived before we could browbeat him into letting loose.

If you want to hear a version of the joke, you can hear the South Park kids tell it here. [Extremely NSFW—you better wear some headphones.]