Super Genuis

There's a dropout named Bobby and a super genius named Greg sitting on a bench waiting on a bus. The genius gets bored, leans over to the dropout and says, "Hey, I'll tell you what, I'll ask you a question and if you don't know the answer you have to give me $5. If you ask me a question and I don't know the answer I have to give you $50."

The dropout says, "Alright, man."

The genius asks the dropout, "What is the Pythagorian Theory?"

The dropout replies, "I don't know." and hands the genius $5.

"Okay," the dropout says, "What has three legs going up a hill and four legs going down?"

The genius thinks real hard and finally gives up. He hands the dropout $50 then asks, "So, what is the answer?"

The dropout says, "I don't know." and hands the genius $5.