Awkward First Impression

"I'm not sure why my girlfriend's father doesn't like me."

"What was your first impression on him?"

"I told him, she calls me daddy too."

Explanation

Explain Bear

Listen up, you uncultured swine. You are a human who has trouble understanding the nuances of humor. This joke is funny because the guy accidentally made a very awkward sexual innuendo when trying to make a good impression. The 'daddy' thing is a big no-no with the father of your girlfriend.