You never notice how effective a car horn is until you use it. I usually park my car near a sidewalk and alarm 7 year olds on their way to and from school. 7 year olds are your target market for this sort of thing. They jump like antelope! All the kids in my neighborhood are acclimatized, now. It isn't as much fun.
You also never notice how effective a Picardy third is until you do it with car horns. You're welcome.