Signs to Grind One's Teeth On

There is a florist in Fernley by which I walk each day. They've put up a sign for graduation season. It drives me a little crazy.

Signs of Teeth Grinding

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.