I was going to mention this. I think it had six different grooves spiraled together, each one playing a different sound, and it was a matter of chance which one the needle fell into. Very clever.

EDIT: I misremembered. The buttons would turn the record to line up the appropriate groove. But I learned that you could get it to play a random sound by pushing the button only halfway down. That's probably what prompted me to take it apart and see how it worked in the first place.