Hee hee - I once scared the crap out of a couple of door-to-door religious folk when they came to my house at the wrong time.
A few years ago, I was having difficulties with epic-sized kidney stones and one morning was waiting for my stepfather to pick me up and take me to the emergency room. I looked like death warmed over (hair standing on end, extreme dark circles from lack of sleep, permanent grimace from the extreme pain, that sort of thing.) I managed to throw on some sweats and crawl to my front door, where I waited. After a few minutes, I heard voices and wasn't sure who it could be, since I was distracted by the pain. When they were in front of my door, I realized what they were, opened the door, screamed, "GO AWAY!!!" and slammed the door shut. They ran away as quickly as they could.