A buisness man is getting onto a plane for a very long flight. He is shown to his seat which happens to be next to a blonde woman. He turns to her and says "Why don't we play a game to make the time go quicker. I'll ask you a question and if you get it wrong you give me £5 and vice-versa."

The blonde declines and turns to go to sleep. So the man says "Ok then, how about for every question you get wrong you pay me £5, and for every one I get wrong I pay you £50?"

Sensing this man won't quit she agrees. So the man asks the first question "What's the distance between the earth and the moon?"

The blonde thinks but has no idea, so she hands the man £5. Then she asks her question "What goes up a hill with four legs and comes down with three?"

The man thinks but is unable to come up with an answer, so he gets out his lap top and searches the internet but with no luck. So he gets his mobile and rings all his friends but none of them can help. After about two hours of this he turns to the blonde, who by this time has fallen asleep, he wakes her and says "Ok, I give up, I dont have the answer."

And with that he hands her £50. She thanks him and turn to go back to sleep. "Well?" the man asks "What does go up a hill with four legs and comes down with three?"

Without blinking the woman reaches into her purse and hands the man £5.