Static electricity: Friction, chemicals, or other processes strip electrons from a surface, creating a positive charge. Because these electrons are not moving, we say it is a static charge. Another surface may have electrons added to it. When a connection is made (such as touching a doorknob after walking on carpet), the electrons cross the gap to "even out" the charges. This doesn't really happen on humid days because the electrons can leak into the moisture in the air.
Home electromagnet: Wrap some wire in a coil around a steel nail, and attach each end to a 9v battery. The nail acts as a magnet as long as power is applied.
Coolest experiment: I thought that testing the conductivity of various materials by using a home electroscope sounded pretty neat-o. I like the idea of actually seeing the like charges repel each other.
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