haha... i just saw the funniest most appropriate joke on simpsons. [but since its not a rerun, i wont be able to post the youtube link until later]:

Lisa and Bart receive a huge amount of shipping boxes for free.
and Bart asks Lisa "now that we have all these boxes what are we going to do with them?"
and Lisa says "Naturally, I have some ideas" and hands bart a peice of paper withe a list on it.
Bart reads it and begins to laugh "Building a fart? How do we do that?"
Lisa replies "It's building a fort, Bart".

Anyway, I thought it was quite appropriate, considering we are building jokes. The relationship between a fart and fort [not just linguistically but also spatially].