Scott, who submitted this photo to the
Apostrophe Catastrophes facebook group, writes, "I saw this in a display case in a school I visited in March. I hope it is student-generated work, and not that of a teacher."

I hope so, too. Also, another group member pointed out that the sign should say
100th, and she wondered why the
p is capitalized.
Oh, the future of America....
Thanks, Scott!