Potions Class Field Trip

Professor Snape was supposed to be taking his class of Fourth Year Slytherins and Gryffindors to a muggle university to learn about the basics of Chemistry. Only, Snape doesn't want to be bothered with something as trivial as that, nor does he ever want to chaperone a 'field trip' again so he takes them, and the Weasley Twins to Walmart with a list of how to get kicked out.