I remember one of these coolers from the last job I worked! Let's just say that before they called me "Water Cooler Chris" I had a more sugary, carbonated nick name. Also, there was a lot more of me to go around.
There's always that one guy who takes JUST ENOUGH from a public food receptacle that he doesn't have to refill or replace anything, but also JUST ENOUGH that what's left in there would barely satisfy a baby midget kitten. Screw that guy.
Our office has about six choices of tea: Three black teas, one green tea, and two mint teas. The black teas run out first, and when they're gone, everyone gripes about it and grimaces whenever they slurp their insufferably sweetened tea. Once I saw someone crying in the corner.