Actually it was a guy on a boat near us. The Westchester police told him that any time his kid was on the boat he had to wear a PFD. The guy correctly advised them that the rule only applied while underway, and, since they were anchored, the kid didn't need to wear the PFD.
The cops kept arguing with him and when they threatened to give him a ticket, the guy picked up the kid and dropped him in the water! (By the way, the kid could swim just fine).
The cops didn't know what to do and just drove away!