Are you talking about where Gandalf recites the poem and everyhting gets dark/hellish and Elrond gets upset?
No, he's talking about a skit from the MTV movie award show featuring a comedian named Black and Buffy the Vampyre Slayer.
They do a very low brow skit intercut with the movie. It really is very well done. And somewhat disgusting. Its also available online somewhere. I can look it up if anyone is interested.