Quite obviously, a can of tuna can save your life if you find yourself in need of food, but these tiny aluminum cans can double as a source of light. To create this simple fishy flashlight, all you need is a can of tuna in oil, a rolled-up piece of paper, and a means of lighting the paper. Similar to the concept of a Molotov cocktail, you’ll puncture the top of the can and slip the rolled paper into it, leaving a small wick on top. After it has soaked up some of the oil, you’ll be able to light the paper, creating a makeshift lantern to get you around in the dark for up to two hours. What's even better, the tuna is still edible afterwards!