Possible "Sign Fail"

I snapped this shot across the street from my son's house. The sun was from the wrong direction, so I was afraid the words on the wooden signs wouldn't show up in my photo. (There were actually TWO signs saying "Don't block the sidewalk" but I had to get up close to ensure that at least one sign was readable and thus couldn't fit both in the photo)  Anyway, I found some irony in it!