Why can't orphans go to a school field trip?
Because he needs the parent's signature.
Orphan's Field Trip
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Explanation
Explain Bear
Hey, nimrod, listen up! The joke is that orphans don't have parents, so they can't get a parent's signature for a field trip. It's funny because it points out the obvious disadvantage of being an orphan. You probably think signatures are something you get from a signature store, you dolt!