Man approaches to greet a new neighbor who is just moving into the house next door and asks what he does for a living.
Neighbor 1: I am a professor at the University, I teach deductive reasoning.
Man: Deductive reasoning? What is that?
Neighbor 1: Let me give you an example. I see you have a dog house out back. By that I deduce that you have a dog.
Man: That's right.
Neighbor 1: The fact that you have a dog, leads me to deduce that you have a family.
Man: Right again.
Neighbor 1: Since you have a family I deduce that you have a wife.
Neighbor 1: And since you have a wife, I can deduce that you are heterosexual.
Neighbor 1: That is deductive reasoning.
.....Later that same day...
Man: Hey I was talking to that new neighbor next door.
Neighbor 2: Is he a nice guy?
Man: Yes, and he has an interesting job.
Neighbor 2: Oh, yeah? What does he do?
Man: He is a professor of deductive reasoning at the University.
Neighbor 2: Deductive reasoning? What's that?
Man: Let me give you an example. Do you have a dog house?
Neighbor 2: No.