"Only if it turns out that reality is actually nothing more than a holographic illusion created by the interplay of subatomic particles on a vast two-dimensional membrane."
This article covers a subject that has been deemed non-canon by either the author or the Back to the Future licensees, and thus should not be taken as a part of the "real" Back to the Future universe.
Douglas J. Needles picked up a bag of Snacky Chips and threw it in the clerk's face when told he had to make a purchase or leave the store.
After Needles was done harassing Marty McFly and Jennifer Parker, he picked up the bag of chips and threw it in the clerk's face again, saying that he had changed his mind about purchasing the chips due to the cholesterol.