Co-workers that take the last cup of coffee in the coffee maker and don't bother to make more. Change filter, put in fresh grounds, push start. There, it's not flippen rocket science and takes all of 30 seconds, if that!!!
I wan't to put a weight sensor under the pot, hook it to a trail camera and a loud siren. Then if the culprit(s) put the take the last cup and don't refill it takes thier picture and sets the alarm off.