[TteFAboB]

A man walks into a book store and the bookseller tries to push him a book about logic:

"Logic? What's logic?"
"It's a kind of reasoning"
"What do you mean?"
"Here, let me give you an example: do you have a fish tank in your home?"
"Yes, I do!"
"It would be logical to deduce that there is water inside it."
"Yes, of course there is!"
"And if there's water, there's certainly fish in it aswell."
"Obviously!"
"Perhaps you have children who look after the fish."
"Yes, I have."
"And if you have children, I can make a logical deduction: you're married."
"Yes, I am!"
"If you're married, then you're not gay"
"No, of course not."
"That's it, that's logic. A kind of reasoning that leads you to sound conclusions."

The man bought everything the bookseller pushed at him and went back home all excited about logic. He meets a friend along the way and attempts to explain everything to him but his friend can't understand, so he tries to give an example:

"Logic is very simple. Look: do you have a fish tank?"
"No."
"Then...you're gay?!"