This could work very well in certain instances. At least it would make people take a second, or third good look at the poster. Oddly enough -perhaps the lack of a perfect picture might even make people more observant of any 'stray' or lost-looking cat they see.....possibly.
And yes, the humour can make a thing stick in a person's memory.
And yes, the humour can make a thing stick in a person's memory.