I just noticed this sound when I was driving with a rear passenger side window opened all the way. All other windows including moonroof were closed, except this one window. It sounds like a helicopter flying right next to me and it even hurts my ears.

Strange, but anyone else noticed this sound?

 

Yes, it happens to most four door automobiles.

 

Yep, same here.

 

that's normal, turbulence in cabin caused by too much wind entering but no way of exiting.