Singing Tesla Coil at Duckon 2007 - creating music with human-made lighting. Be sure to read the description.
Frequent exchange in our household:
abovenyquist: "Honey, can I build a..."
joyeuse13: (matter of factly) "No."
She's learned that the thing following "can I build a" usually involves high voltage, propane, plasma...
(I'm just kidding. I'm a good theoretician but my mechanical skills are sufficiently low that know to stay clear of such projects. I'm not sure our homeowner's insurance covers plasma.)