Twilight the musical.
the funniest thing I have seen on youtube since... well for a while.
watch it now. 
ps. since I am lame I haven't figured out how to post the youtube videos directally here you hafta clicky the link. And there are 4 parts out so far, I think. (1, 2, 3a and 3b)

www.youtube.com/watch

rofl.