I'm thinking of a movie joke............

[Ninth Path]

I have a house full of people who will not be able to sleep unless we determine the movie this joke is in, and the actual joke.

Clues we know:
Maybe Fight Club or Pulp Fiction (maybe Jackie Brown)?
Joke takes place on a plane...the pilot accidentally has the microphone on, says something, stuardess runs to cockpit, and a passenger gives the joke....
What movie is it?
What's the actual joke?