A man visits a zoo and asks to speak to the director about the new "Rent-an-Animal" program. The zoo has fallen on hard times financially, so they decided to rent some of their animals outside the usual visitation hours. Usually its the small, cuddly ones, but this man asks for one of the elephants.
"An elephant?" The zoo director asks.
"Yes, the biggest one you have, please", the man says, quite certain.
"I mean, we can do that", the director muses, "But it won't be cheap. That's $5,000 per day of rental alone and an additional $4,000$ for transportation. And you'll need to feed the elephant on your own bill, too."
"That will not be a problem", the man says. "I'll just need him for a day, so here's $10,000 for your troubles."
With that settled, the elephant gets transported to the mans address.
"Very good. Put him in the bedroom on the second floor", the man orders. The personnel tries to get the elephant into the house, but he just doesn't fit through the door. Without hesitation, the man calls a construction company and rents a crane to get the elephant up, through the dismantled window and then re-seal the window at horrifyingly high cost.
"You know what, it is none of my business", the zoo director asks at this point, "but I must know: What is this for?"
"Well, you see", the man explains, "My wife's brother is living with us and he's a horrible know-it-all. Every quiz show we watch, he blurts out the answers before we can even take a guess. Every morning, he solves our crossword puzzles. He has beaten me fifteen times in a row at Trivial Pursuit. But this evening. This evening he will go upstairs, come back down and say: 'Hey, guess what, there's an elephant in my bedroom.' And I won't even look up from my book and just say 'Yes I know.'"