Next time you're tempted to flip the bird, remember, nothing gets to these people more than a smile and a wave.

It's a magic gesture. It makes the people who really are nice people at heart and maybe are just having a bad day realize that they're being jerks and taking it out on other people, and calms them down.

And it makes people who really are jerks really steamed.

And it calms you down.

Everyone winds up getting what they deserve.