Strange fraud scheme of the day: cheque kiting. http://www.wisegeek.com/what-is-check-kiting.htm
This reminds me of when I realized that you can actually store data in internet links. How much data? Well, bandwidth*latency. As soon as it emerges from one end of the link, send it back the other way. Ta da! Free storage! Well, storage someone else pays for, as long as you keep churning your CPU.