one of my biggest fears is that i will go slightly deaf in one of my ears, just slightly, so that what I hear in one ear is like a semi-tone off, so music will forever sound absolutely terrible.  It happened once with my headphones; it was late at night, my computer had been doing video work all day and was running a little hot, and I noticed that in my headphones, one headphone wasn’t playing the music right and the other one was, and it was so dissonent and terrible… And I was freaking out i thought i was losing my mind.  But then I rebooted and everything was SWELL.