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If you haven't read the joke, read it before I ruin it by explaining it.
The reason that the joke is funny has more to do with expectations than the punch line itself. People will expect a clever and/or funny explanation for the last wish of him getting a half peach head. People are wondering in their heads, while hearing or reading the joke, 'under what circumstance would this guy accedentally or have to make such a wish?'. Then when you get to the last line, it's just he made a mistake making the wish. No clever typical joke ending. Thats what's so funny.
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