Deductive Reasoning

I was reminded by some bad logic on TV today of this joke:

Neighbor 1: Hi, there, new neighbor, it sure is a mighty nice day to be moving.
New Neighbor: Yes, it is, and people around here seem extremely friendly.
Neighbor 1: So what is it you do for a living?
New Neighbor: I am a professor at the University; I teach deductive reasoning.
Neighbor 1: Deductive reasoning– what is that?
New Neighbor: Let me give you an example. I see you have a dog house out back. By
that I deduce that you have a dog.
Neighbor 1: That is right.
New Neighbor: The fact that you have a dog leads me to deduce that you have a
family.
Neighbor 1: Right again.
New Neighbor: Since you have a family I deduce that you have a wife.
Neighbor 1: Correct!
New Neighbor: And since you have a wife, I can deduce that you are heterosexual.
Neighbor 1: Yup.
New Neighbor: That is deductive reasoning.
Neighbor 1: Cool.

Later that same day…

Neighbor 1: Hey, I was talking to that new guy who moved in next door.
Neighbor 2: Is he a nice guy?
Neighbor 1: Yes, and he has an interesting job.
Neighbor 2: Oh, what does he do?
Neighbor 1: He’s a professor of deductive reasoning at the University.
Neighbor 2: Deductive reasoning– what is that?
Neighbor 1: Let me give you an example. Do you have a dog house?
Neighbor 2: No.
Neighbor 1: Fag!

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