Just reading the newspaper I came across a link to the most amazing website; a guy who works with tesla coils and 500,000 volts of electricity to create the most amazing displays.
Now don't ask me what a tesla coil is; I need a few more hours to work that out. But I seriously respect anybody who can get 500,000 volts of electricity to do what they want. Check out this photo; and take a look at his website. Now that's a hobby!