http://www.youtube.com/watch?v=uGcUBw0GUUQ&feature=relatedProbably the wrong-est and funniest thing you'll ever hear.
It's an audiobook edit done by DirtyPotterOfficial, and has been very popular since then. It got banned a few months back, but got re-uploaded again.
It will ruin your childhood in too many ways to imagine, but it made me laugh way more than I was supposed to.
Like I said, it's only an audio edit, so no video (THANKFULLY IT BEEN SO).
PS: Dirty potter 1 isn't way as funny as 2 & 3 in my opinion.