Finally something something to do with these things:

http://izismile.com/2010/03/24/cool_tesla_coil_performance.html
http://www.youtube.com/watch?v=3ff_AXVlo9U
http://www.youtube.com/watch?v=fRqj374cc2o

http://en.wikipedia.org/wiki/Plasma_arc_loudspeaker

http://www.youtube.com/watch?v=VX5V_9s0Gfw now this is awesome

Another thing you can do with a Tesla coil: car thief protection.

http://www.youtube.com/watch?v=9nRqbQr7VGk

nice

I just noticed too. They have the best sawtooth sound imo, just check out the Star Wars performance.

They are extremely loud as well:
http://www.youtube.com/watch?v=LVDmjnCQ1g4&NR=1

I would love one as a home speaker (http://www.youtube.com/watch?v=YyVTvtgm11o)