Behold! I have created Schrödinger's elf!
The premise is simple. I have locked an elf in a room with some tools, some refreshments, and a radioactive source connected to a gieger counter, connected to a device that selects one of two sets of toy manufacturing instructions based on the gieger counter readings.
Until I look in the room, the elf has simultaneously made both toys at the same time!
If I can take advantage of this, I could double… wait… nevermind, he climbed out of the window.