It's incredible the shit we forget but remains bubbling under the surface, ready to be referenced at a moment's notice. Hadn't thought about flashing cars for cops in decades. Now I can picture doing it five times a night in my teens. Another thing connected to this thread: Saying "pididdle" when you see a car with a busted headlight.
I absolutely still flash my lights when possible to warn other drivers about John Law around the bend running revenue.