It's funny you say that as a -320 pilot (I'm not Airbus bashing at the moment, but I'll be happy to do so at the drop of a hat
). When I first came to the airlines years ago from flying corporate, I used to commute somewhat regularly on an A-320. I was always amazed by how much that fuselage flexed and that I could actually SEE the seats/sidewalls/bins moving in relation to one an other - somewhat unnerving! I guess I'm jaded now, because I don't notice any of them doing so anymore (or maybe it's just because I'm already asleep by the time the door closes!).
Sorry, nothing of any actual value in this post - just chuckling and reminiscing!