There used to appear bumper stickers that said:
Visualize Using Your Turn Signal
I maintain that the new generation of bumper stickers -- anti-war, anti-administraiton, anti-violence, anti-anti -- would be completely unnecessary if people remembered the mantra of that simple sticker of long ago.
Do you know how much kinder and gentler I'd be if people signalled before they cut me off? And, after all, peace begins with me.
Well, actually peace begins with pea, but you get the idea.