I've never seen anyone put the stickers on the bumper guard before, this is new. I wonder why they aren't on the hatchback or window

bumper stickers spotted in traffic

 

So, I had to look that up

Bumper sticker innuendo

 from Schott's Sporting, Gaming and Idling Miscellany

one of the rare early paper bumper stickers with wires that were hung on bumpers before the adhesive thing was figured out

https://forums.aaca.org/topic/341211-period-images-to-relieve-some-of-the-stress/page/351/

I posted some that were at an auction in 2024 https://justacarguy.blogspot.com/2024/06/tom-told-me-about-paper-signs-put-on.html