I figured the picture of the farmer and the cow with the words Milking in Progress on the sign on my door would be clue not to come in. Nope. When I heard the knock, I did not respond because I couldn't think of what to say in that split second that would be nice but also could in no way be interpreted as come on in. Which he did. Total stranger. His eyes went straight the horns of course, and then he just stood there, looking around my office (he's with the alarm company and I am sure he was looking for my motion detector, because once he saw it, he shut the door. ) That is, after he IGNORED my shut the door! Shut the door! for about 20 seconds. Which is a LONG time to have your nipples getting sucked into plastic tubes in a stranger's company.