One that was seen in Boulder during the '96 election campaign (Everyone wanted one but it turned out it was a hand-made, one-of-a-kind) Dole for Pineapple.
One I have never actually put on my car even though it's true most of the time -- it's stuck up in my study and in my storage locker: I'd rather be translating Latin.
A book title that I'd like to see on a bumper sticker: The heart is a little to the left.