saw this one today:

"Obey Gravity, it's the Law".

It sucks too. I saw one a few years ago that was a parody on the one the Episcopal church put out about practacing acts of kindness + senseless beauty,which read "Kiss random ass you sad + senseless hippie." It was on a VW so I guess they could laugh at themselves.

Mean people suck
Nice people swallow

Or one of the best

So Many Cats so Few Recipes

"I found It"
"It made my finger Stink"

Driver carries no cash.
He's married.

I saw one years ago while on an elk hunt in Montana. It was on a cattle truck full of horses and cowboys and read:
"HIPPIES ARE LIVING PROOF THAT COWBOYS SCREW SHEEP"

Dane,just a play on words,Gravity sucks was my intention.