My window cleaner is a very nice man, but very loud. He also doesnt have a set time of the fortnight when he cleans my windows, usually comes when he likes.
Today my young DD is a bit under a weather and I spent the best part of an hour settling her and getting her asleep for her nap. As soon as she fell asleep, the door knocked - the window cleaner.
I almost certainly know that if I opened the door she wake up, so I did something very naughty and pretended I wasntin 
I sat in the kitchen and drank a coffee and heard him washthe living room window. Just that one.
He then posted a note through the door saying all front windows washed with a bill for the full price!
I know I was probably being a bit rude for ignoring the door but I had my reasons. Im shocked he has tried to charge me full price when he only washed one window (took about 30 seconds)
Time for a new window cleaner I think ...