Grocer's apostrophe

Ah...the joys of the internet....I learned something new today. On one of the music lists to which I subscribe, someone from the UK posted an apology for his "grocer's apostrophe". It turns out it is a term known here in the USA in some regions, but I'd never heard it. Being in the 4th generation of school teachers in my family, I am particularly sensitive to proper spelling and punctuation in ads and in everything I read. The grocer's apostrophe is that misplacement we've all seen in which the apostrophe is used incorrectly, i.e., egg's $2.00/doz. I knew this misuse was an epidemic, but I didn't know it was international, nor did I know there was a NAME for this!!

Here's my favorite signature line for this epidemic, borrowed I think, from a friend in the Atlanta Symphony:

My your his her our their its
I'm you're he's she's we're they're it's