400 Hertz

[Bill Lapham]

"CAN YOU HEAR ME?"

"Yes; what?"

"CAN YOU HEAR THAT?"

"Hear what?"

"THAT FUCKING SUBMARINE SOUND!"

"What the hell does a submarine sound like?"

"LIKE THIS: Weeeeeeeeeeeeeeeee  HOLD IT eeeeeeeeeeeeeeeeee ONLY WITHOUT THE W!"

[Gita]

I think the ceiling fan in my office makes the four hundred Hz frequency:   http://www.youtube.com/watch?v=ddP9YWpAK0A

[Adrian George Nicolae]

I hear a sort of static now and again, appears and goes out of nowhere.

[Mike Handley]

So that's what that fucking sound is! I hear it all the time, like I'm tuned into any dwelling's electrical wiring. The only relief is when I'm in Bumfuck, Egypt, in the middle of the woods ... until the cicadas come out to play.

[Angela]

I have discussions with Mr. Man like this all the time, since I am seriously hearing impaired on the right side.  When I wear earbuds, I can't tell when the right one falls out unless I happen to look down.

Funny.