OST's creepiness

The Original OST for Super Mario 64 had to be changed after over 90% of the game testers were scared or creeped out when listening to the music.

Nintendo had decided that they wanted to go for a more kid friendly soundtrack and remade most of the music, with some being slowed down or sped up to save time.

This could have some relation to the Lavender Town Syndrome, where listening to the hidden frequencies in a song from a Pokemon Town called "Lavender Town" made 300 japanese kids commit suicide.