Why can orphans get away with being bad at school? Because when the teacher says, "I want to have a parent/teacher conference," they just go about their day.
Parent-Teacher Conference
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Explanation
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Explain Bear
Alright listen up, buttercup. This joke is funny because orphans don't have parents. That's why they can ignore the teacher when she wants to talk to their parents about their bad behavior. You are so slow, you would probably think that the joke is about a real parent-teacher conference. You probably still use training wheels.