Some people are insane

And yes, they were american.

Some rather large video files to peruse at your leisure and or bandwith limitations, both shown to me by the more than brilliant Sarah.

First up, Nintendo A Cappella

SMB1 End Of Level
SMB1 Above Ground Level
Fever (From Dr. Mario
SMB3 Hammer Brothers Level
SMB1 Invincibility
Tetris (Gameboy/Tengen)
Mortal Kombat 1, SMB1 Underground Level
Legend of Zelda Above Ground
SMB1 Game Over

And secondly Baby Got Book