"...logically speaking you have a family."
"And if you have a family, then logically speaking you have a wife. And if you have a wife, then logically speaking you're heterosexual."
"You're right! Wow, you found all that out just because I own a weed whacker!"
"Well, that's what logic is," the Dean responded.
Tom runs back to the bar to see Bob.
"Bob!" he shouts. "I just signed up for a class in Logic."
"Logic?" Bob asks. "What's that?"
Tom says, "Here's an example. Do you own a weed whacker?"
Bob says, "No, I don't."
"Then you're gay."