Just want to make sure I'm not crazy. When I was on an MD-88 recently, sitting at a wing exit, it looked as though the overhead bins above my head were being pulled out away from the center of the fuselage and bouncing back whenever we went over a large bump on the taxiway. It seemed as thought the whole side of the fuselage was doing the same thing, as well. This was even more apparent during takeoff roll. Somebody please tell me if this is normal...or if the plane I was in should be retired. The pulling effect seemed to coincide with the "bouncing" of the flexible wing. (Excuse me for not knowing how to put this in technical terms.) I have been a passenger many times before, and never noticed this. I am guessing that the fuselage is built to flex a bit to revent breakage and that is all I was seeing. But f anyone out there knows exactly what I am talking about, please explain. Thanks! Yes, good CRM would have told me to ask the pilot, but as a not-so-experienced private certificate holder, I was too shy. Didn't want anyone to think I was under the influence of something.