Apparently you didn't detect the subtlety in my post. The detector alarms for the wire in the underwire bra. So TSA thinks it need to do grop-a-thon on the unfortunate granny who wears an underwire bra.
That's odd. I regularly wear an underwire bra through the metal detector, I haven't managed to set one off in years. I also wear glasses, a watch, and jeans with a metal zipper. I do take off my shoes however since I regularly wear boots with metal in them.