Odd Crying/Screaming? Sounds

have you guys noticed that when you press O, minimize sound effects volume then increase it again you can always hear someone yelling? everytime you move the bar towards the right there'll be a sound.

creepy!

If you keep clicking and move the slider around rapidly, it sounds like someone is either incredibly constipated, vomiting horribly, being severely tortured, or they're acting in a really bad porn.

And you can move it either direction, by the way. Actually, you don't have to move it at all, just click on the slider. On the login screen, I get the Ranger sound effects everytime. It's different for each character class in game.

Well,ya,it's to test your sound levels.And,I would think it's the sound that plays when one of the classes takes a hit and stuff.