It is easy to put up a sign and convey your message, but to do so in a memorable way requires a bit more care and attention. One bar owner in the Wichita airport did just that as he attempted to attract passengers to stop in for a drink before their flight: Here = Nice Drinks. Up ahead -- Dunno. Maybe Bears?! Wouldn't Risk It!
It's handwritten on a chalk board, but that only serves to help it stand out in the sea of commercialism that airports have become.
Your humor doesn't have to be pervasive or lofty, but a dash of it can bring in a smile or two, even if it doesn't bring in a customer. Think of how you can add some whimsy to your next communication. Dunno, it might save you from the bears.