To continue the thought:
It ain't the voltage that counts, it is the current (amps) or wattage (volts X amps).
Walking across the carpet in your slippers can easily generate 10,000 volts... But it it is micro amps of current. Even at 10,000 volts the best 'work' you can get out of the 'juice' is a flicker in a fluorescent bulb.
Yeah, urine as an electrolyte on the right materials can generate some elecricity, but is is a VERY inefficient one. Vinegar, grapefruit juice or even cola drinks are better. A gallon of the stuff won't run an average light bulb for five minutes.
This statement is just more pseudo science for the ignorant masses.