Not EXACTLY a graffito, but close enough for the purpose:

Sixty years ago, when I was in high school, I saw this.

Across the street from the high school was a church, with a huge neon sign, saying, "JESUS SAVES".

One morning, on coming to school, we all saw, attached just below that sign, a very large fabric banner, saying, "GOLD BOND STAMPS".

I might also tell you that the neon sign was evidently on a timer, and it turned off at 12 p.m. So the saying around our school was, "Jesus Saves till midnight; after that, you're on your own!"

Dave Oesterreich