Why can an orphan go to a store to buy something and what can come back home?
Because they don't have a home.
An Orphan's Purchase
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Explanation
Experiment
Explain Bear
Alright listen up, genius. This "joke" is stating that orphans don't have a home so they can't come back HOME with an item they bought. It's playing on the double meaning of "come back home" as both returning to a physical house and being the place that they live. You probably think the Earth is flat, don't you?