You are locked in a completely empty room with no tools. You are given a bag with cooked pistachios. Most of the pistachios are fully open, but some are only partially open. You are not able to open the latter pistachios with your hands, feet or teeth. Is there a way you can open them?
This is a real-world puzzle without any tricks.
P.S. I love pistachios. In fact I am going to have some right now!