If you're a normal person who happens to find yourself in a desperate need to light a fire and you have, like, no fire lighting equipment... you're screwed. But wait! If you can pee, you'll be totally fine. The guys at The King of Random figured out how to light a fire with urine.
Of course, it's not as simple as pissing and seeing flames erupt on the ground beneath you, but it doesn't seem as hard as you think either. Basically, you're filling a plastic bag with pee to use your piss as a magnifying glass to burn things. When the burning starts, you feed the fire and bam, you've got fire by peeing. And a bunch of pee on your burnt hands. [YouTube via The King of Random via Laughing Squid]