I try not to put stickers on my car, but I do put them on my
dulcimer case (the link is for the curious, the apathetic can ... well, they'll ignore it regardless, won't they?).
I have an old "Picard Riker '96" sticker on it, but my favorite is the one that says:
"Meddle not in the affairs of dragons, for crunchy thou art, and tasty with catsup"