When I was in the USAF (Homestead AFB, 76-79), I had a lot of fun correcting the spelling and grammar that was written on the mens' room stalls. (In their infinite wisdom, the commanders had large tablets of paper put up on each stall wall so they didn't have to repaint all the time.)

For a long time, I signed it, "Three", which was simply the employee number I put on the work records (00003). Then some full-bird moved in and wanted a low number, and I wound up with some obscure number to use. So I changed my signature to the "Spelling Bee", each one with a bunch of dotted lines and a little drawing of a bee at the end.

Man, did I ever get a lot of splatterback on that hobby! Nobody ever figured out who it was, though, and I had an absolute blast doing it.

Now I'm in the adult education field and it pisses me off to no end when my colleagues publish something that's full of punctuation, spelling and grammatical errors. The one that I scream loudest about is those who use the apostrophe to make a word plural! I've even sent around web links about how to properly use the apostrophe, but it doesn't seem to sink in.

Note rule #3 in the following link:
http://www.apostrophe.org.uk/