How hot do AMD Athlon CPUs run? Hot enough to fry an egg, some might surmise, and so one gentleman tried it and was completely successful. He used British coins (copper ones, natch) as a heat sink, put a layer of aluminum foil on top, powered up his system, and in 11 minutes he had breakfast. And the CPU was none the worse afterwards!
The full story for those who are interested:
http://www.handyscripts.co.uk/trubador_egg.htm