Like water on a stone, small un-professionalisms chip away at one's morale. What part of this sign, hanging on my door, is so unclear that a person STILL KNOCKS and then tries the door to see if it's unlocked, so they can barge in while I am working? Seriously. WHAT IS UNCLEAR? https://twitter.com/drsekula/status/1088836735981764610/photo/1 https://chirp.cooleysekula.net/attachment/53926