+ for Tig.
I keep hearing the sound of an old man's hearing aid feeding back.
Yes, I am almost as old as dirty dirt, but I can still hear. Several of us were at least seventy feet away in a highly sound-charged environment - I work at a Best Buy store and it is always very loud inside there when the store is open. The music was blasting from seven different directions and I could hear it all, but there was something that was constant in all that noise. While I have lost most of teh hearing I had as a younger man, I still have a decent analytical sense to what I can still, just barely hear.
Anything producing a constant, unwavering tone can not possibly be a part of what we normally have to deal with and I could sense this horrid, constant tone from all that distance.
I told the guys (and gals) that there was something wrong and we needed to move our "party" toward the problem to find out what it was. They only half believed me, but followed. I just followed the sound I was hearing.
Turns out that there was an older man with two hearing aids whose auditory enhancement devices had reached beyond their potential and were giving him a constant tone, feeding back upon themselves. I asked him to take them out so he could her us, better.
Oddly, I was the first to hear it from a distance. One of the girls could hear it, after we had walked about forty or fifty feet closer to where it was coming from, but I still did not know what I was hearing, that was so disturbing.
The horror is, that image has created a memory page inside my head, almost like an earworm or something.
I just know that my time is just around the corner.