Once Again And I Think It's A Sin

Sometimes, right after takeoff, there is a strange sound on the plane that comes from right under where I sit. This sound vibrates the entire galley, enough to make my vision blur, and you spell this sound like this:

WABWABWABWAABWAABWAAABWAAABWAAABwaaawaaawaaawaaaaaah

Finally mentioned it to a pilot the other day, and he explained that it's the landing gear spinning to a stop inside the plane when they retract it.
Damn those are some big wheels.