We tend to think of people peeing on fires to put them out, but a survivalist needs to be resourceful. So: here's a way to use your own pee to start a fire.
The technique involves wrapping your pee up in some plastic wrap so that it acts as a lens for the sun's rays. You could also use plain water, but then the headline above wouldn't be quite as interesting.
I sure hope they washed their hands after making the video below.