Portal: Terminal Velocity: http://www.youtube.com/watch?v=AsdEXlPsobI
Second, i've encountered a couple new songs at Malediction and Wumpskate recently. Actually, i've encountered a lot of new songs, but two i liked well enough and remembered well enough to track down (with a little help, thanks balivatn =)
Metric - Help I'm Alive: http://www.youtube.com/watch?v=we_czU9sJ3g
And One - Back Home: http://www.youtube.com/watch?v=lEk6mPOrxp8
According to wikipedia, Metric is a Canadian indie rock band and And One is a "German New Wave, synthpop and EBM band". Judging by the number of hits on the videos i'd say that one is just a tiny bit more popular than the other.
Finally, just cause, someone put together a composite video of every clip of maniacal laughter from every movie ever. Okay, not _all_ of them, but it does kinda seem that way :)
100 Greatest Maniacal Movie Laughs http://www.youtube.com/watch?v=WaIJKM0sjdo