I'm surprised no one mentioned any of these one take lip dubs done by college kids in Singapore. The first one especially is great.

http://www.youtube.com/watch?v=oHHojpdwnTs

http://www.youtube.com/watch?v=nm6YKpzpsPA

http://www.youtube.com/watch?v=UDaD4PcB2fk

http://www.youtube.com/watch?v=CEZ7gJGTd3A