I am constantly surprised at how clever dogs can be.
My example today is Geoff and the Kongs. Geoff gets his dinner stuffed in 3 kongs. This stops him from inhaling his meal in 3 seconds flat. It takes him a bit longer to wheedle it all out from a Kong. When my kids bring the kongs in to get his dinner ready, they throw them on the ground and any remnants jump out.
Last night I watched Geoff take each kong from his dinner dish, take it over to our pool area and drop it off a 1m high retaining wall onto the tiles below, so it bounced. He then sauntered down the stairs and ate all the dinner that had jumped out, without all the bother of trying to dig it out himself. He repeated it twice more so it was all premeditated. We haven't taught him this, he worked it out watching the boys.
What has your dog worked out by itself?