Concise French lesson: In French cop television series (highly amusing, Xavier loves them) the cops
vouvoient (use the "
vous") with citizens until they have committed some sort of "
connerie" (wrongdoing), then they start yelling after the person, chasing them in the street using the "
tu" - "
arrete-toi !" They no longer have the right to be vouvoyed. This amuses me thoroughly.