A group of researchers working out of the University of the West of England in Bristol have designed special socks that are capable of harnessing your bodily fluids and using it to generate electricity.
The socks are fitted with a number of silicon tubes that line the heel and are connected to a group of microbial fuel cells that are embedded by the ankle. When you walk around, urine is pumped from a special bladder through the tube and into the fuel cells, where bacteria convert the liquid materials into an electrical charge.
These socks are not yet ready for consumers but, as weird as they sound, they offer promise in a wide variety of applications. They could be used in military applications in the field of battle, or could be used by hardcore hikers liable to find themselves stranded in emergency situations.