Why didn't the doctor help the orphan?
Because he was a family doctor!
Family Doctor
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Explanation
Experiment
Explain Bear
Listen here, pal. This joke is funny because it relies on the double meaning of "family doctor." You see, a "family doctor" is a general practitioner, which is a type of doctor. In this case the doctor cannot help because the orphan has no family, and a family doctor can only treat families. It's wordplay, get it? I bet you didn't, because you are dumb.