Kids. They say such absurd things. Some more than others. In this case, a youngster turned an innocuous knock knock joke into a genuinely awkward moment, turning off a cute girl in the process. Watch the exchange below: Knock, Knock Joke
The transcript as we best understand it: Boy: Superman on what?
Girl: I have no possible idea... that's all I know of the joke.
Boy: Might be on a hotdog?! [smiles deviously]
Girl: Yeah ... [scoots away from ...