invention request

you know how when you're smelling perfumes at a store, they put out little dishes of coffee beans to clear your nose in between fragrance samples?  (they do.)  well, i need the equivalent to clear my brain between papers i'm grading.  to get a song out of one's head, one of my wise dissertation advisors advocated humming a few bars of black sabbath's "ironman."  and you know what?  it TOTALLY works.  erases the annoying persistent tune and then erases itself.  what could i put in my brain that will do that for student prose?