Chewin in the Chung

Heisenberg, Gödel, and Chomsky walk into a bar. Heisenberg says, "From the fact that we are all here, I can infer that this is a joke, but cannot determine whether or not it is funny." Gödel says, "No, we can't tell if the joke is funny because we're inside it -- if we could observe ourselves from the outside, we would know." Chomsky sighs and shakes his head. "No, no," he says, "the joke is funny. You're just telling it wrong."