Apostrophe’s I Don’t Understand [OT]

When did this trend of pluralizing words by adding a gratuitous apostrophe before the s begin? I don’t remember seeing this before a few years ago, and now it’s all over the place. Certainly nobody ever learned this in school.

English is a very tough language to learn. Just about THE ONLY THING THAT’S EASY is being able to pluralize most words by adding an s.