"Battery out of juice? Urine luck: Sorry, just had to get that out of my system before I mentioned a new power source on the market that you'll want to recharge in private. Now on sale in Japan, NoPoPo (Non-Pollution Power) Aqua Batteries come in AA and AAA sizes and can be renewed three to five times by adding a few drops of urine (or other bodily fluids more painful, troublesome or embarrassing to produce for this purpose). And it's green -- the technology, I mean..."

From the 'Good Morning Silicon Valley' newsletter.