Cheap, simple, levitating party lamp. It can produce some interesting reactions. Easy to build, easy to make the exterior look good (eventhough I didn't). Fun to build.
Fry an egg on an Intel Pentium 1 (non MMX). The Pentium omlette. Timelapsed. Ingredients: Intel Pentium 1 > 100Mhz ;) , AT PSU, 7808 voltage regulator, and 1 egg
I think this is from the Russian Farm Fox Experiment.
You may have read about making PCBs using a laser printer and photo paper, but previous demonstrations showed that it's quite messy and inefficient. I'd like to prove the contrary :) The secret's in using satin-matte paper instead of high-gloss. With this you can make professional PCBs at home minus the soap-water scrubbing associated with high-gloss paper. Simple and clean :)