I am content. I am *con*tent. Are you content with (m)y content? I hope that with any semantic satiation you're feeling is paired with sexual satiation
(M)any materials experience "fatigue", where, because of cyclic loading, they'll begin to deform or even fail well below their theoretical yield strength
Small particles in a gas or liquid constantly (m)ove around randomly. Work on this "Brownian motion" led to the acceptance of atoms as physical reality