World's most conspicuous punctuation error?

[prism]

Saw this the other day on a street in Chicago. In case you can't see the image, it says "National Teacher's Academy". It is, literally, written in stone...

[TheBuskersDog]

It could be correct if it is an academy belonging to one teacher, but I'm guessing it isn't.

[BlackeyedSusan]

Oops!

[FastWindow]

You win!!! That's shocking and yet not surprising...

[tethersend]

Hahaha

[CalamitouslyWrong]

That teacher must be busy. I wouldn't want to be the national teacher.