A little purple flame.

A pathetic specimen of a tesla coil.
Here's the circuit diagram if you wanna build one and B E A B S O L U T E L Y C A R E F U L O N W H A T Y O U ' RE D O I N G because you're gonna handle mains voltage which's gonna kill you IF not handled properly: images.app.goo...
[This video was recorded a few months ago]