First time I've ever heard it, but my dad mentions it once in a while. I have to imagine gym class 40 or 50 years ago was led by a paddle wielding, former drill sergeant and all the kids in the class wore the same blue shorts and white tops and canvas shoes and it's not that everyone was required to wear the same thing, it's that no one had invented other appropriate gym clothing, and gym class was like some boot camp hell week packed in to an hour. Then, 20 years later, someone invented day-glo bike shorts and terrible hair. We line danced to Billy Ray Cyrus under what can barely be called "supervision". Seriously, Billy Ray Cyrus. I'm not saying one experience is more traumatizing than the other, I'm saying it's pretty easy to figure out what's wrong with us. Gym class.