This phenomenon of household items finding their way around the house is called "domestic drift." In our house, this is more like Household Hurricane, specifically Hurricane Moe, who has a tendency to run into a room, pick up a toy (or more likely some small piece of a toy) and run away with it. Usually, he drops it somewhere where it is easily spotted, but sometimes things become well and truly lost.
This drives me crazy. I cannot stand things like missing puzzle pieces, and always try to make sure I have every piece before cleaning up a toy. But inevitably, something will be missing.
The best thing to do is generally just wait and the piece will turn up eventually. But sometimes you get a brand new toy that has three penguins and then one day later you only have two penguins and you really just want to find the blue penguin because you know it is somewhere in the house and most of the doors have been closed all day so where the f*@# could it be? And other times, you bring out the cool Hanukkah toys, which had all of their pieces, but in two days have lost two candles and one flame.
|It will be a miracle if I still have all these pieces after 8 days.|
But still no penguin.
Update: I have located the penguin! It was in the fish tank. I am not making this up.