Reminds me of the guy who up on his roof doing some work. It was a steep rood so he tied some rope around his waist and tied the other end to the bumper of his car. His wife didn't know what he was doing and at some she decided to drive to the store...you can figger out the rest of the story.
Oh my, that will give me nightmares. In my case my wife didn't know I was hanging there she just happened to come out to see how it was going. Her first instinct was the knife. I was about 20 feet from the ground, that would have made a mark.