My bumper sticker reads: I might look weird but I’d kick your ass on Jeopardy.
This is the one I have seen:
Thank God I am an Atheist.
I want one that says this:
God is thankful you are an Atheist.
so I can drive in front of the person with the other one. 
Is agnostic
File under: I wish I could respond to that one.
Response:So is salad. Tofu Too.
Visualize whirled peas.
Do not meddle in the affairs of Dragons, for you are Crunchy and Good With Ketchup.(in a fancy, olde english-type font).
My mom had one in the '70’s from the John Birch Society, next to a peace sign it said “Footprint of the American Chicken”.
Lasted about a week, then somebody scraped it off. Can’t for the life of me imagine why? :rolleyes:
Only bumper sticker she’s ever had in her life, too.
I had one that said “All men are animals, but some make good pets.” Alas, my husband whined so much I finally took it off.
On another car I had “I’m sorry, I’m out of my mind, but I’ll be back shortly.”
I have a bumper sticker on my car which reads:
"Nice Marmot." The Achievers amongst you will get it.
I used to have one that would cause people to stop, and look, and read, and re-read…it was fun to watch them in the parking lot.
“AWAANDBILEYERHIED”
Which is Glaswegian for “go and boil your head.”
I always liked Visualize Whirled Peas
Vegatarian, Indian word for lousy hunter.
There’s a local store here which caters to Wiccans and Pagans, with bumper stickers, buttons and other things with sayings like this on them. Others I remember seeing–
“Recovering Catholic”
“God please save me from your followers”
“My other car is a broom”
And, my personal favorite (which I’d buy if I was Wiccan)–
“I weigh the same as a duck”
On the car I usually park next to:
Cthulhu Saves
In case he gets hungry later.
I just saw this one today:
“If you’re not completely appalled, you’re not paying attention.”
Seen in the last year:
Still pissed at Yoko
fandj
for the D&D’rs out there:
Jesus Saves.
Everyone else takes 2d6 damage.
some i’d like to make:
Don’t mind my driving.
I dropped my beer.
Don’t like my driving?
Call: 1-800-Budwieser
My personal favorite that i’ve seen:
My kid beat up your honor student
and:
My son was Inmate of the Month
at (local) County Jail.
My kid sold your honor student the answers to the test
What if the Hokey Pokey really is what it’s all about?
Not Jesus. The damn cleric!
Where’s the damn cleric when you need 'em?!
Arrrrrrrgh! My HPs are at -10 again!
Time to create a new character. 
D&D? What’s that? looks around innocently
What Would Scooby Do?
And in reference to the University of South Carolina Gamecocks:
You can’t lick our Cocks
My favorite (seen in the NW):
“I don’t take shit. I don’t give shit. I am not in the shit business.”
“My Karma ran over your Dogma”
Humpty Dumpty was pushed!
Eat right, exercise, die anyway.
I had “Visualize Whirled Peas” on my old car. My husband won’t let me put any stickers on our current car. I don’t know why not, it might cover up a few of the rust spots.