4th track off of
Tool's album
AEnima. It's the sound a record player makes when it's skipping. A lot of people use it as a prank to play on the listener--if you buy the
vinyl version of AEnima, it's at the end of the first side so you wouldn't know it was even a track.
The mentality behind Useful Idiot is as follows: The high ranking
Soviets used this term for people who supported the Soviet government no matter what. They simply sat around believing in the government and hoping that things would get better. They were useful, as support, but idiots for believing that they wouldn't run out of bread.