The Joke: What do you call a person with no body and no nose? Nobody knows. The joke asks what you call a person with: No body: Literally, they lack a physical torso and limbs. No nose: They lack the organ used for smelling. The Wordplay: When you say the punchline "Nobody knows" out loud, it functions as a double entendre: If you have no body and no nose, you are—quite literally—"no body nose." "Nobody knows": This is a common English idiom meaning "no one has the answer" or "it is a mystery." The humor comes from the fact that the answer sounds like a standard conversational phrase, but it is actually a literal description of the ridiculous person described in the setup.