Yeah, I don't know why he said that but it just reminded me of what I do when I knock on people's doors. I do it once and then runaway and hide in a place where I can see them but they can't see me, then if someone comes out, I wait until they go back in. Wait a while (so they're not right at the door when I do it again) and then do it again and again until they really pissed off and that's where I run away as far as possible. Good times!