Agree Genghis,
Next time this chap is flying any sort of aircraft he should look out to his left or right and monitor the flex in the wings. How un-comfortable is he with elasticity now?
My father is a retired chief eng in the merchant navy and has some fantastic footage of being down in the bowels of the hull whilst looking down a long corridor. As the hull distorts in response to the motion of the ship upon the waves the view down the corridor becomes visible and obscured. Quite remarkable, and much better than the alternative of the hull snapping into pieces and spilling the black stuff. The same applies to wings or any load bearing part of an airframe, provided of course that the behaviour is elastic and within design limits.