There’s absolutely nothing practical about this, but you have to admire someone who goes to this much effort just to prove it can be done. Someone added 5 PCI cards to a PC, each with 6 USB ports, and used the power from all 30 of those ports to supply the power to heat a small grill. (Each USB port can supply, at most, 500 mA, which means that this little grill could theoretically draw up to 15 amps—not too shabby.)
(From Gizmodo; original page (in Japanese) at http://xe.bz/aho/24/.)
