Long before he was known for The Ultimate Showdown, Neil Cicierega started a popular trend of making crazy music videos from random images and strange foreign songs. The best example would be the movie that started it all:
The following videos are also by Neil, thus making them official Animutations:
Also well known is Too Much Spare Time's "Colin Mochrie vs Jesus H. Christ" Fanimutation trilogy.
The remaining videos are Fanimutations by fans, as well as videos that fit the general theme!