I think this has to be crudest car sticker I've ever seen. While driving, I saw an old beater car (Crown Victoria) with its paint faded, signs of rust corrosion everywhere and duct tape holding parts of the car together. It was a miracle the car was still road worthy! The car was plastered with stickers but one of them caught my eye:
Don't laugh, your daughter could be in the back seat!
Creative, but definitely a little crude!