I apologize for using such a provocative title for such a simple idea. I have been doing this for a while, but have never read about it on the forum. I actually discovered it by watching my boy dropping a light on the bottom of the bath tub to achieve the same effect. So I thought I would post to see if anyone else uses their McGizmo tools in this manner.
1. Turn on your favorite McGizmo. For example, pull out your Hi CRI mule, and click it on.
2. Hold the light in one hand and smack the tail with the heel of your other hand with some force in rapid succession. The important thing is to hit on a harder part of your body so it stops quick. If you are not a wimp, a knuckle works great, and looks cool, too.
And? Get it?
I actually find it easier to sorta reverse that by rapping the tail of the light into the heel of my hand, rather than spanking the light.
If you don't get it to work with only a little bump, try it first on a table top or your knees. You need a hard surface, not a hard hit.
I would make a video, but it is soooo simple it seems pretentious to do so.