FFXIV OST - Kefka's Theme (Dancing Mad)
https://www.youtube.com/watch?v=KFRhYuB93qk
Everything goes wrong at the 6min mark.
I bet some of you is wondering why Kefka is in FFXIV in the first place, so a little bit of a background story as to how this is possible. Straight to the point without giving to much away: these are virtual test simulations made by Omega.