In my driver's ed class in high school, we watched a video in which a man with a rather small head, a fanny pack, and a white baseball cap drove around in a full-sized van lightly honking at people to let them know when he wanted to change lanes, pass them, proceed at a 4-way intersection, or just give a friendly "hello".
At least they didn't dress him up all normal-like, to give the impression that unimpaired people actually honk at each other like that, or there'd be some good ol' fashioned highway shootings going on every six months around here.