Then there's my mom in which when she has a completely full glass of water, she'll yell "Be careful and don't spill it"
There are people who have an almost full glass, and complain that they're missing a few drops and how they're failures because they don't have those drops and just want to end it all.
Of course there's people who when they have a totally empty glass will act as if the glass is overflowing while they're dying of thirst yet will not accept water because they will only drink Perrier.
Aren't there any accurate water glass estimators out there? ;)