Signage that says "Please Deface Me"

Sometimes an ad design has unintended meaning. Sometimes they just don't work. But would you design an ad that just begged to be defaced? I doubt these two are intentional, but I've seen all kinds of creative additions to them.

On this one I've seen a big smile, a Mister Bill "Oh Noooo", and a Rolling Stones style lips & tongue.

This forest fire prevention one has had several names added. Use your imagination. :)