Why does Japan not allow little boys to run?
Because the last time a little boy came, Japan lost a state.
Little Boys in Japan
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Explanation
Explain Bear
This joke plays on the double meaning of the word "came." On the surface, it refers to a little boy arriving in Japan. But it also alludes to ejaculation, implying that the boy's sexual act was so powerful it caused Japan to lose a state. So, the joke uses a crude and suggestive image to create humor.