Bumper stickers that I have actually seen:
Official Government Policy: If it ain't broke, fix it till' it is.
Just because you're child was an honor student doesn't mean you know anything.
If you can read this than your close enough that I could slam and my brakes and sue you.
(T-Shirt on a Motorcyclist) If you can read this than the bitch fell off.
Keep honking, I'm reloading.