[TeMPOraL]

Quite often, recipients of those stickers totally deserve it. I recommend watching some of the videos from the channel 'vermontdevil linked to.

I thought few times about starting something similar in Poland but then I understood StopXam really works only because they're government-backed program, so if someone gets too angry about having half of their windshield covered in a "I don't respect people" stickers, the police will bring him to order quickly.