Futurama: 15 Obscure Easter Eggs & References You Probably Missed
5. Kleins Beer
In the first scene of The Route of All Evil, Fry and Bender are buying beer from 7/11, and theres a few great science jokes in here. As we pan across we see Kleins Beer, which is in a Klein bottle. A Klein bottle is a shape that only has one side, as described by German mathematician Felix Klein. Its a non-orientable object, kind of like a Möbius strip. Right next to that we have St. Pauli Exclusion Principle Girl Beer, a play both on the actual beer St. Pauli Girl and on the principle of quantum mechanics which says that two identical fermions cant occupy the same quantum state at the same time. Thats quite a lot packed into a five second panning shot of beer.
