Inference Memes

The professor's shirt says "There are two types of people in this world: 1) Those who can extrapolate from incomplete data" — and that's it! No second point! The genius here is that the joke itself requires you to extrapolate what #2 would be (obviously "those who cannot"). The students asking if the shirt is missing a second part completely missed that they've become living proof of the shirt's message! It's like failing a test that tells you exactly what's on it. Pure mathematical irony in fabric form!