The file
Not a pizza-flavored chip, a chip made from pizza. Pizzarias were cut from real dough, which gave them a chewier crunch than Doritos and a smell that took over the whole lunchroom.
They were huge for about five years and then gone when Keebler's chip business changed hands in the late '90s. Every few years a petition circulates. So far, nothing.
Sources: Wikipedia — Keebler Company