I think the bench imprint-vertising still takes the annoying cake, but this here is close. I've been meaning to post this obnoxious piece of Ad Creep for months (It's from 2005, before I started this stupid site.).
This is the ambient ad equivalent of lighting a bag of dog shit on fire, ringing the doorbell, and running. Its ingeniousness is far outweighed by its invasiveness. I catch you putting that over my peephole, and I rip you a new asshole.
Ad agency: Quórum/Nazca Saatchi & Saatchi, Peru.