Kenny Everett: (Old British Comedian, Now Dead

. Look him up)
THE ADVENTURES OF CAPTAIN KREMMEN!
Carla: What are you doing, Captain?
Kremmen: Well, my little cosmic cutie-pie, I'm completing this I.Q. test for the Advanced Space Technology Course. Here's a tricky little question. "If it takes five men fifteen hours to build a brick wall, how long would it take ten men?"
Carla: To do what, captain?
Kremmen: To build the wall, Carla.
Carla: What wall is that, captain?
Kremmen: The brick wall.
Carla: But isn't the wall already built, captain?
Kremmen: How do you mean?
Carla: But I thought you said that the five men already built the wall?
Kremmen: They did, Carla, but now ten men are gonna build it.
Carla: I don't get it, are the ten men going to build another wall?
Kremmen: No, Carla, it's the same wall.
Carla: Well, why would they want to do that? Didn't they like the way the five men built the wall?
Kremmen: Carla, this is a hypothetical wall.
Carla: You said it was brick!
Kremmen: It IS brick, you stupid space-nymph! What we're trying to find out is if it took five men fifteen hours to build a wall, how long would it take ten men?"
Carla: Well, what were the ten men doing when the five men were building the wall in the first place? I mean, why didn't they help build the whole thing, it could have been done in no time!
Kremmen: Carla, talking to you is like talking to a brick wall!
Carla: Which wall is that, captain?