A joke from my Philosophy textbook

The employer introduced himself to his new gardener.

"I am a professor of logic," the employer said.
"Oh. What's that?" the gardener asked.
"I shall give you a demonstration," announced the professor. "Do you own a wheelbarrow?"
"Yes," replied the gardener.
"Then I infer you are a hard worker," the professor continued. "And from that I infer you have a family. And from that I infer you are conscientious and responsible. And from that I infer you are a conservative. Am I right?"
"Wow!" exclaimed the gardener. "That's right! So that's logic?"
"That's logic," preened the professor.

Later the gardener met up with one of his buddies and told him he had a job with a professor of logic.

"Logic?" his friend asked. "What's that?"
"I'll show you," the gardener said. "Do you own a wheelbarrow?"

"No."

"Stupid liberal."