My office is a part of our living room and my lovely partner, Tony has a habit of spotting me at my desk, forgetting that I'm working and wafting in to tell me science facts. (Usually about singularities, black holes and binary stars of late.) And while I love a good science fact, the primal roar that I emit when interrupted mid-sentence edit is apt to terrify the average science fact imparting bunny to a premature bunny death.
SO! This was Tony's solution. An autopilot caltrop! I love it.
It's sitting in the door of my office/our living room whenever I'm working and HE SHALL NOT PASS!
(If this doesn't work, we're going to have to hire a door dragon, who could also correct the spelling of lich, but hey, what's a board without a sneaky typo or two.)