Purple Peanut Butter is a purple goo that smells similar to peanut butter. In Beware of the Purple Peanut Butter, if reader chooses to snack on the goo, they gradually shrink after consumption.
Goosebumps: The Game
The Purple Peanut Butter appears in Goosebumps: The Game. It can be found in the cabinets of the kitchen inside Dead House. Strangely in the game, it's just normal peanut butter, besides its color.