upon the purchase of what seemed to be a kid/college owned 87 subaru in 2006 there was old school stickers complete with rotting scooby doo air freshener (genuine hanna barbera licensed) that self combusted in the sun one day (it wasn't in the car), there was a bumper sticker that said "what would scooby do?" (also genuine).. I don't like stickers, so I started scraping it off and left it at "what would do?" 20+/- years after...
Once I build a boat-tail for the Insight, I might need a sticker that says "Don't laugh, it gets 100mpg." Assuming it actually does get 100mpg, of course.