Okay, you're on stage and find out that your effects pedal doesn't work and you don't have a replacement battery or power adaptor handy. What to do? How about using candle power?
That's exactly what the ZVex Candela Vibrophase does. It relies on the heat from a simple tea candle to power the pedal and is actually a pretty complex piece of machinery.
This is not a cheap device at around $6k, but I guarantee that everyone will be talking about you if buy one.