It may seem a little far fetched, but this may just be true. According to four teenage girls out of nigeria it is possible to generate 6 hours of electricity with a 1 liter sample of urine. No need to test this out for yourself as wastewater treatment plants have been doing this for years. They extract the Hydrogen and other particles in order to help produce electricity. Don't start saving your pee or buying up lots of synthetic urine just yet, as it takes more energy to extract the hydrogen than it produces.