We don't have a designated lactation room so I use a small conference room for pumping. The door doesn't lock so I put a Occupied sign on the door and also put a chair behind the door. Despite this, a male coworker (luckily, not our office creep)barged in today when I was pumping. He only saw me for a few seconds so it wasn't a big deal! HR was quick to apologize, etc.

Has anyone ever walked in on you?