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Denny Byrnes is Jack Byrnes' pothead son and a minor antagonist in Meet The Parents.  After Greg has to borrow some of his clothes, Denny shows Jack his marijuana pipe and claims that it belongs to Greg, causing Jack to view Greg as a pothead.  He also makes fun of Greg's real name, Gaylord.

However, Denny can be considered more of an anti-villain as opposed to a downright villain.