There was a print shop about a block away from my dad's business that had a changeable marquee sign (like a church sign) that always had funny sayings up on it, which, since they weren't a church, tended towards the merely humorous instead of religious. I guess the business didn't rely on drive-by customers, as I never once saw them actually advertise on the sign.
Sadly, shortly before I moved away from my hometown, the sign ended up with a smaller sign on it saying "This sign used to be funny, but someone stole our letters!"