Joke: A blonde and a lawyer are sitting next to each other on a plane. The lawyer asks the blonde if she wants to play a game, "All you have to do is ask a question and if i get it wrong or don't know it i give you five dollars, then i ask you a question and if you get it wrong you pay me five dollars." 

"No," she says, "I just want to sleep." 

He keeps asking and she finally gives in when he says if he gets it wrong he will pay her five hundred dollars, but she still only has to pay five dollars. 

"What is the distance from the earth to the moon?" he asks. 

She gives him 5 dollars. "What goes up the hill with four legs and comes down with five?" she asks. 

He pulls out his laptop and searches it, but finds nothing. Then he emails his friends. After an hour, he still hasn't got an answer, he hands her 500 dollars. Then he asks her, "So what is the answer?" 

She hands him 5 dollars.