Here's a great video of Jean Baudin, a virtuoso bass-player, playing the theme from Super Mario Brothers on a gigantic oversized nine-string electric bass.
5.3MB Quicktime Link, Mirror Link, Torrent Link
(Thanks, Westfall, Gary and Chris!)
Update: Waldo sez, "It's not a 'nine-string bass' that he's is playing, it's a Chapman Stick. Well-known Stick performers include Tony Levin."
Update 2: Ray Brown sez, "BB reader Waldo claims the bass that Jean Baudin is using is actually a Chapman Stick. This is false. The bass Jean is using has its own page here."