Wow, I thought I was an oddball because I can hear high-pitched "buzzes" that most people can't hear. I guess other people can hear them, too. Like you, trunks2k, I can detect the high pitched sound that a TV makes when it is muted.
I sometimes like to fall asleep with a fan running, to drown out the noises from outside. The other night I actually found myself getting restless because I was hearing the high-pitched "tone" that was being produced as a result of the fan's running motor. It was awful, but I finally managed to fall asleep.
In remote places (such as the mountains) where it is absolutely quiet....devoid of any birds, nature sounds, winds, human sounds, etc... some people can actually detect a high-pitched buzzing or ringing inside their ear, and it can be quite annoying. It has happened to me on several occasions, and I think I can truly understand what it means when people say "the silence was deafening" - because that ringing in the ear can be really loud, even in total silence.