Hickory dickory dock. My wife avoids my cock. She's losing her and having an affair. So I had to slap Chris Rock.
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Explanation
The joke plays on the nursery rhyme 'Hickory Dickory Dock', substituting the last line with a reference to slapping Chris Rock. It implies the speaker's wife is unfaithful, and in a fit of rage, the speaker slaps Chris Rock. The humor comes from the unexpected and violent twist.