Drinking water is something everyone does, but the way zuck does it emotionless and detached conveys high IQ energy as it shows that he doesn't need to put energy into doing such a trivial thing, instead presumably using his energy on high IQ things.
This plays into the last thing aswell, while most avis are looking at the user, this one does not, this also concludes that the user is low IQ and unimportant, just like the water.
Almost on par with the ER vanilla latte avi
