It's noon. You have 10 minutes to get to your next class, but that growling stomach has a mind of its own. You shouldn't have slept in and skipped breakfast today. It's your long day. You still have a lab to go to and dinner is too far in the future to be of any good to you. The choices you have vary, including cutting class or whatever is during the only possible meal, a vending machine which will give you a false sense of satisfaction, buying a sandwich with your limited number of Frog Bucks or something that will fill you without emptying your wallet.