Every time I see those “Baby on Board” stickers on cars, I hear a very Seinfeldian voice in my head saying, “Oh really? Well in that case, I won’t recklessly ram into your car. I was about to, but now I see you have a baby in there, I’d better quell my homicidal traffic instincts and slow down. I’ll wait for some non-breeder to take out my rage on”.

Clearly, they are very effective.