When you go to your girlfriend's house but accidentally go into her dad's room and fuck him anyway.
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Explanation
Explain Bear
Alright, listen up, buttercup. This joke is about someone who meant to visit his girlfriend but ended up in her dad's room...doing the nasty. It's funny because it's totally inappropriate and unexpected. Plus, you gotta wonder, how does one "accidentally" do that? You probably still live at home, dingus.