Now I hate the "grocer's 's'" and do not understand why so many people seem to think that any word with an s on the end of must actually end in "'s," but in this case it's even worse. Why do it to some words but not others?
These signs make me wonder what the people making them were thinking. But I also know that trying to correct them is pointless. They would look at you with an utter lack of comprehension, not understanding a word you were saying.