Two guys are sitting in a bar, talking.

"What do you do for a living?" says one guy.

"Oh, I'm a professor of deductive reasoning."

"What is deductive reasoning?" he responds.

"Well, let me give you an example: Do you have a swing set?" he asks?

"Yes"

"Well, from the fact that you have a swing set, I can deduce that you have kids. From the fact that you have kids, means you're probably married. And from the fact that you're married, I can deduce that you're probably straight."

"Wow! That's pretty cool." he says.

Armed with his new knowledge about deductive reasoning, the next week he is in a bar, talking to another guy. "I just learned about this thing called deductive reasoning." He says.

The other guy says "What's that??"

He says "I'll give you an example: Do you have a swing set?"

The guys says "No I don't"

He replies "FAG!"