Here are two (correct) arguments that are highly analogous.

Brownian motion, the fact that a particle in water or air does not come to rest, but dances at a minimal rate is an important piece of evidence for the atomic hypothesis. Indeed, Leucippus and Democritus are said to have derived the atomic hypothesis from Brownian motion; certainly Lucretius provided it as evidence.

Similarly, Darwin worried that "blending" inheritance would destroy variation in quantitative traits. He failed to reach the conclusion that heredity should be discrete, though.