Here's Bill Gates getting excited about a thing called a Janicki Omniprocessor -- a clever miniature processing station that turns sewage into water, electricity and harmless ash to use as a fertiliser. We'll drink (Coke from a can) to that.
The sewer sludge is first boiled to condense out the water from the everything else, with the remaining dry solids fed into a fire. The heat from this fire is used to make steam to run a turbine and generate electricity, producing enough power to run itself and feed a surplus back out to the local grid.
And the water's so pure it's even safe enough for a billionaire to enjoy:
But if your boys release something as bad as Windows 8 again, Bill, you're drinking it straight from the toilet bowl next time. [YouTube]