Question 1: What is the definition of a vector space?
Answer: A set V satisfying the axiom that for any x in V, x has a little arrow drawn over it.
Question 2: How do you tell that you are in the hands of the Mathematical Mafia?
Answer: They make you an offer that you can't understand.
Question 3: How does a mathematician induce good behavior in her children?
Answer: I've told you n times, I've told you n+1 times...
Question 4: What did Pythagoras say when he was confronted by the square root of 2?
Answer: There has to be a rational explanation for this....
Question 5: What is the square root of ab?