I almost did the wrong house a few weeks ago. I had a first clean to do, and I make a point of knocking the door first. No answer, and as it was school run time I assumed that she would be back soon, so decided to make a start. As I started the first window, the front door opens and a chap demands to know what I am doing. I ask him is this number 26. No it was next door! I tried to apologise but this chap didn't want to listen, and was not nice, not nice at all, and I left in as dignified a manner as I could muster!
John