The first apartment I ever had, many many hears ago, I was getting off work at 7 am & had this girlfriend that would show up about 9. We are in bed kicking it. A knock comes at the door. As you might imagine, the door goes unanswered. Second knock, same response. A key goes in & I hear the door open! I jump up, grab a Colt Python 6" blue & run to the hallway to the door, throw down & yell freeze. There stands a terrified teenager holding a a/c filter with his eyes bugging out. I am stark naked & ready for action (not just with the pistol). After a second or two, I step back behind the doorway & ask what he's doing in my apartment. He says, "I came to change the a/c filter, but I'll come back later!" I say, "didn't they tell you I only work 10 days a month & am home most of the time during the day so not to come in?" He says "no sir, but I never will again" (with great sincerity). I said, "go ahead & put the filter in & lock the door on your way out."
Later I went to the office to clarify our agreement. Now it has changed & they tell me they cant guarantee this. I said "ask that young man changing the filters if he will again!"