This gave me a good laugh, especially so as it's probably the first lighthearted thread I've written in a while so it's done me some good anyway.
Last week I took in a parcel for the neighbours - it was a large box, signed for it, all well and good so far. That evening the neighbours must've been out as when I knocked no-one answered.
The next day I caught the woman coming home and went over with the parcel. She looked slightly confused and told me that she hadn't been expecting anything but as the box was addressed to her she took it in anyway.
A few days later on my way out I saw the man (her husband) coming out of the house, waved hello as usual and he said "Oh hi JustAnotherOP, like ruining other people's Christmases do you?" I looked slightly puzzled and asked what he meant. Turns out that the parcel I'd handed over to the woman was actually her main Xmas present which she had subsequently opened.