Thanks to frequent photographer Scott, who writes:

Attached is a photo of a sticker I saw in my travels this week. I couldn’t believe someone would be so brusque. It may not be ‘fitting’ for a highlight on your site but I thought you could add it to your collection anyway. File this one under ‘moral decay’ or ‘how to ensure car horns are worn out in short order’.

Someone should outlaw this kind of bumper sticker.