In Futurama episode "Mars University" (S01E11), Dr. Farnsworth lectured on the mathematics of quantum neutrino fields (aka Math of Wonton Burrito Meals). On the blackboard, one can see the following diagram, "Witten's Dog". Dr. Farnsworth concludes that, " by process of elimination, the electron must taste like grapeade."
According to Wikipedia and this page, " Witten's Dog ", named after Ed Witten, is a parody of the classic Schrödinger's cat paradox. Astrophysicist David Schiminovich created both the equations and the diagram, based on "an equation that constrains the mass density of neutrinos in the universe".