I just remembered this story. My mother had joined a gym a few years ago. She didn't have any workout clothes so I said that she could borrow a t-shirt from my bedroom. Unbeknownst to her, she had grabbed a purple t-shirt with my letters on the back. She was in the middle of trying to figure out the equipment when girls came up to her and started to talk to her, "Oh my GAWD, you're in D PHI E! WE'RE in D PHI E!" (My mother recounted this story to me using her best valley girl voice which is pretty funny.) My mother had no idea what they were talking about. She thought that it was some kind of gym speak because this was her first time in the gym. Only after she changed clothes and saw the back of the shirt did she realize what they had meant.