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Logic

Two farmers, Jim and Emerson, are sitting in their favorite bar drinking beer. Jim turns to Emerson and says, "You know, I'm tired of going through life without an education. Tomorrow I think I'll go to the Community College and sign up for some classes."

Emerson thinks it's a good idea, and the two leave. The next day Jim goes down to the college and meets the dean of admissions, who signs him up for the four basic classes: math,
English, history, and logic.

"Logic?" Jim says. "What's that?"
The dean says, "I'll show you. Do you own a weed eater?"

"Yeah."

"Then logically because you own a weed eater, I think that you would have a yard."

"That's true, I do have a yard."

"I'm not done," the dean says. "Because you have a yard, I think logically that you would have a house."

"Yes, I do have a house."

"And because you have a house, I think that you might logically have a family."

"I have a family."

"I'm not done yet. Because you have a family, then logically you must have a wife."

"Yes, I do have a wife."

"And because you have a wife, then logically you must be a heterosexual."

"I am a heterosexual. That's amazing, you were able to find out all of that because I have a weed eater."

Excited to take the class now, Jim shakes the dean's hand and leaves to go meet Emerson at the bar. He tells Emerson about his classes, how he is signed up for math, English, history, and logic.

"Logic?" Emerson says, "What's that?"

Jim says, "I'll show you. Do you have a weed eater?"

"No."

"Then you're gay."
 
Originally posted by: stan394
but yeah If A -> B. !A not necessarily -> !B

But !B -> !A has to always be valid, if A -> B.

However, this joke is not an example of A -> B because it follows assumptions instead of logic.
 
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