A solicitor and a blonde woman are sitting next to each other on a long flight.

The solicitor asks if she would like to play a fun game. The blonde is tired and just wants to take a nap, so she politely declines and tries to catch a few winks.

The solicitor persists that the game is a lot of fun. "I ask you a question, and if you don't know the answer, you pay me only £5; you ask me one, and if I don't know the answer, I will pay you £500." This catches the blonde's attention; and, to keep him quiet, she agrees to play the game.

The solicitor asks the first question. "What's the distance from the earth to the moon?" The blonde doesn't say a word, reaches in to her purse, pulls out a five pounds note, and hands it to the solicitor.

Now, it's the blonde's turn. She asks the solicitor, "What goes up a hill with three legs, and comes down with four?"

The solicitor uses his laptop, searches all references. He searches Google and many other sites on the Net. He sends e-mails to all the smart friends he knows, all to no avail. After an hour or two searching he finally gives up. He wakes up the blonde and hands her £500. The blonde takes the £500 and goes back to sleep.

The solicitor is going nuts not knowing the answer. He wakes her up and asks, "Well, so what does goes up a hill with three legs and comes down with four?"