I don't know how many people have heard of Weird Al, because he's not that well known in the UK. For those of you who don't, he's a comic musician (A sort of American Bill Bailey), who is mainly famous for parodies of famous songs. I got a DVD of his music videos the other day and really liked them.
Here are two of his most famous videos:
White and Nerdy - Parody of Ridin' by Chamillionaire and Krayzie Bone. His most successful yet to date, reaching number 9 in America.
Amish Paradise - Parody of Gangsters Paradise by Coolio. The song orignally got him into trouble with Coolio, who claimed not to give him permission to make the song.