My ears are too old

In class today, I was teaching what is destined to go down in the record books as one of the best ever since I had someone observing me. As soon as that woman left, you could see the relief in the kids' eyes and the desire to dump all things Silas Marner. One of my jokesters did something I could not see or hear and all the kids began to screetch at him and tell him to stop. I asked what was going on, and the kids looked at me wide eyed. "You can't hear that, Mrs. Cumby?" (I know, not the best nickname I've ended up with). I couldn't and asked him to do it again. Again, nothing. Here's where I realize I must be the butt of some joke and that the kids are making a mockery of me, despite the fact that I thought they liked me. The kids' claim was that they had a cell phone ring that only kids could hear and that old people over 40 couldn't. I said, "But I'm only 27" (28? I don't remember and I don't want to do math right now) Then I realized God was the one playing the mean joke on me when I read this:

http://www.nytimes.com/2006/06/12/technology/12ring.html?ex=1165035600&en=ba67bc7c170a7a51&ei=5070

Basically, a company created a device to annoy teens that adults couldn't hear to run off vagrant hobo kids hanging outside places. But some kid got smart and made it into a cell phone ring and they all can use it in class while the old fogies (yup, that would include me) keep going without knowing. Just when I was feeling better about getting old, this happens...