So this is a fad response to this thing, made by LittleshyFiM: https://www.youtube.com/watch?v=Yj32wCe--LA

Here's a full playlist of all the responses to this silly fad:
https://www.youtube.com/playlist?list=PLfu8OwqMlN0S6zRIbRIiXS0X6VZ-2Wtcv

And then this fad was featured on EqD for some reason:
http://www.equestriadaily.com/2014/05/everypony-in-club-mini-pmv-compilation.html

Music:
Knife Party - LRAD