Horn when stationary? Very useful when the car in front starts to roll back when you are stopped in traffic. OK, you're officially driving but I bet most of us have used the horn when parked for both good and bad reasons.
Not so nice when kids are left in a car and they play tunes on it until the parents come back and give them a clip round the ear. Whoops, can't do that, a mild telling off will have to do.
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