This occurs when someone leaves just enough coffee in the pot to make it look like there's some left, but in reality it is less than a full cup, and doesn't start a new pot of coffee to make up for this transgression.
Dude 1: Dude....what the F?!?!?
Dude 2: What dude?
Dude 1: Did you just totally date rape the coffee pot?
Dude: F'ing co-workers! Always date raping the coffee pot before I get in the office!