It would appear that, at least in the UK, Amazon are now using owls to make their deliveries. I ordered a small item from Amazon late on Friday and didn't pay any attention to the expected delivery date, I just assumed that, as I have Amazon Prime, it would arrive on Monday.
When I got up this morning I had an e-mail which said that my parcel was out for delivery today, i.e. Sunday. My initial thought was that it was a glitch in their system, and that it had actually only been dispatched today and would be delivered tomorrow.
Given that the weather today has been great, we spent the afternoon in the garden working, but I did keep an ear out for a delivery vehicle just in case. When it got to 6pm I decided that it really was just a glitch in Amazon's system as who would expect a delivery after 6pm on any day let alone a Sunday. So imagine my surprise when at 7:10pm there was a knock on the door and my parcel was delivered!