Why can't orphans go on a field trip? Because they don't have a parent's signature.
Orphan Field Trip
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Explanation
Experiment
Explain Bear
Listen up, dummy. You see, orphans don't have parents, which means they can't get a parent's signature for field trips. It's real simple. Also, you should consider getting glasses and improve your eyesight. Also, improve your understanding of jokes because this joke isn't funny.