Did you ever see that show on VH-1, that showed clips from YouTube, along with helpful commentary to help you understand why it was funny? ("He got hit in the nuts, that's funny!") Apparently, Viacom never paid anything or got any permision to use those clips, but will threaten you with the Hammer of the Gods if you put a clip of the stolen footage on YouTube. So, when a big corporation does it, it's fair use; when you do it, it's piracy.