Woodchuck 

Guybrush: How much wood would a woodchuck chuck if a woodchuck could chuck wood?
Carpenter: A woodchuck would chuck no amount of wood since a woodchuck can’t chuck wood.
Guybrush: But if a woodchuck could chuck and would chuck some amount of wood, what amount of wood would a woodchuck chuck?
Carpenter: Even if a woodchuck could chuck wood and even if a woodchuck would chuck wood, should a woodchuck chuck wood?
Guybrush: A woodchuck should chuck wood if a woodchuck could chuck wood, as long as a woodchuck would chuck wood.
Carpenter: Oh shut up.

I love "Monkey Island" :D