Yep, I left all of mine on my Honda and my truck.
I have two that say, "Give War a Chance" and "I "heart" Halliburton."
I've only got positive responses. People usually drive by and beep and give me a thumbs up!
Think I'll leave them on for a while...
I have the I (heart) Haliburton on mine and i was called a nazi on the freeway once.