I saw a sticker the other day:
You’re just jealous because the voices talk to me
A Few years ago, my sister couldn’t sell her lil Mazda 323 until I stuck a NIN sticker on the back window.
I saw this one on a car here at college and I like it a lot:
The last time we mixed religion and politics, people were burned at the stake.
I’ve also see a lot of cars with web addresses across the top of their front window. The only one I remember is http://www.signguy.com, never been there though…