No clue why I never thought of this and wow does it work. I thought it trickery as the guy making the video is one of the best VFX users on youtube (freddiwW's partner Brandon). But, I looked up half a doxen move of these and this works so amazingly well.
https://www.youtube.com/watch?v=F2C_MhGJQGk
Totally safe for work, but turn sound down, loud.