Swear to God I saw this one:
If you are what you eat, I'll be you in the morning!
I had to read that one a few times because I figured I read it wrong (did it really mean what I thought?), but I guess there's only one way you can interpret that.
In Tejas, where trucks (big ones at that) seem to be most popular, and it seems all Ford owners hate Dodge owners, a friend of mine (Dodge owner) had this made for him.. Diesel engines..
I'd rather be Cummin than Strokin
I also saw an old beat up hatchback with the "Fuck You, You Fucking Fuck" sticker mentioned earlier, square in the middle of the hatch back glass. I couldn't stop laughing and thinking that the guy driving had some big balls!
Lord, that's funny.
Here's some I remember my college roommate had:
Sex is like a pizza; when it's good-it's very good, & when it's bad-it's still pretty good.
Others:
Avenge Yourself: Live Long Enough To Be a Burden to your Children.
My personal fave:
Just Divorced
This one is unique...I recall a woman (working in construction) driving a dumpster type truck that said:
"Pickup drivers can dump their load into mine"