I'm a sad, sad individual. I'm one of those who will riff on fanfiction, of all things. Heck, I've made fun of a lot of the posts that were made by an admin at a Kingdom Hearts roleplaying forum. I lack the technology (and probably the finesse, as well) to riff on movies, short films, and Youtube videos and post the results online, so all the more power to the folks behind the fan riffings.