THE WEIRDEST FLASH ANIMATIONS EVER!
Big files, relatively long loadtimes if not on cable/DSL, audio essential for the full experience, doesn't matter if you have crap hearing though because you won't be able to make out the real words of the songs anyway, probably not work-safe. Yup.
First up, a definition of Animutation from Wikipedia. So you know what you're viewing (and why the same sprites are getting used over and over again).
The site of the guy who invented this aka www.animutation.com. Most of the songs are Japanese Pokemon anime songs. Most of the flashes... aren't really to my taste.
Irrational Exuberance by VeryLowSodium. Utterly bizarre (but at least vaguely coherent). Based on a song called Yatta which is apparently from the Japanese version of Saturday Night Live. So they're not a real boyband, then. Phew.
French Erotic Film by Andrew Kepple. Actually has very little to do with French erotic films. Wikipedia says the actual lyric is Weet je wat ik wil. I worry that I realised it was in Dutch before seeing the actual title of the song. There is a sequel, called Plan 9 From Underpants. And a finale Conquest of Animutopia. These are good because they feature karaoke-style "what they think the lyrics should be".
Suzukisan by Dwedit. The Excessively Cute Kitten of baaaaaabyanimals fame just adds to the surreality, I feel. Also features ewoks.
If you enjoy these, please remember to pick up your brain from the surreality clinic, and try the community animutation. Yep.