Does an applied force always deform or move an object, even at a minuscule scale?

Two examples led to this question.

1. Skyscrapers are built to sway a bit in the wind to preserve structural integrity. This made me wonder if even smaller structures, like a house or a shed, move (or are deformed) by wind, even if it would extremely hard to measure that movement or deformation.

2. The above thought made me remember a old conversation I had with my high school physics teacher. The problem was related to measuring the angle of deformation if a weight were hung on a metal rod. It seems to me that a small enough weight (say an empty hanger) on a metal closet rod, would not result in any deformation. But whatever formula we were using would result in some small angle for even the slightest weight.

It seems intuitive that there is some weight an object can take without any deformation or movement before it starts to move or deform. Is this correct, or is there anyways some slight deformation / movement when a force is applied?