From Slashdot: "Seriously though, as someone who has a hearing range beyond the standard I sympathise with people forced to endure irritating stimuli that noone else notices and hence cares about. I remember having to leave a bar once because the tube was going on their old television; the high pitched screech was like nails down a blackboard. My girlfriend thought I was mad."
A CRT TV will generally make a 15.7kHz squeal because of the flyback transformer. Not everyone can hear this high: between ages 20 and 40 most people lose hearing down from 20kHz to 10kHz.
