Here is more on the Tesla coil from wikipedia:

A Tesla coil is an electrical resonant transformer circuit invented by Nikola Tesla around 1891.^[1] It is used to produce high-voltage, low-current, high frequencyalternating-current electricity. Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits.

Today their main use is for entertainment and educational displays, although small coils are still used today as leak detectors for high vacuum systems

Commenter Nicole had this to say:

When i finally become a mad scientist I will demand that this be played every time I enter my lab

This is a pure scientific entertainment video!  We hope you like it!