This student was once in a Property Law class where the professor was talking about his pet peeve, the mechanic's liens. Essentially (in Rhode Island), if a contractor doesn't pay the mechanic/carpenter/whatever, the mechanic can sell the thing he worked on to get his pay, even if its some dude's house. This usually leads to a mechanic getting a settlement from a guy who had alreadly paid the contractor. A student raised her hand in support of the law, and said, "Well, my dad works as a carpenter..." The professor, an ex-trial lawyer, without missing a beat, smiled and said,
"Oh, my dad was a plumber, so of course he loved that law, it meant he always got paid!" The student, not knowing what to say, nodded, and the professor went on to the next subject.
Well played, sir.