This is a science fair project that I did in middle school and completely disgusted the entire female staff of Benton Middle. The purpose of this project is to show how the electric chair works and discuss basic electricity - currents and conductivity.
This is perhaps not the most politically correct science fair project, but it definitely gets attention. And although it is more based on presentation than science, most people find it very interesting to learn how an electric chair works. :D
This instructable is quite lengthy, though some parts are optional. You'll probably want to scan each section to find what you're looking for. Have fun and happy building!
Also, please note that I will be linking to Amazon.com
for the materials used within this project.