It's an Ice cream machine that refills on it's own. When said ice cream is consumed, subjects begin to hallucinate various childhood memories, and the flavor depends on the most prominent smell experienced at the location of the memory. When the foundation manages to find the factory where the ice cream machine came from, they find some very spooky things, mainly being that there are hundreds of kids hooked up to a giant machine which drains them of all of their childhood memories and results in their body becoming a mindless husk, in order to give the ice cream it's anomalous effect.
One time, I ate a bagel