I often tell my friends that I believe my smile to be preternaturally disarming. It's distractingly perfect, but there is also a perfectly logical explanation for why it's there -- I am happy or pleased or charming or all three. It's effectiveness lies in its innocence, getting people to put their guard down and allowing me to have relatively free reign with them. That is the point of any disarming.
I primarily practice psychological disarming, but I was sent this video by a reader. Although it is directed at the physical disarming realm, I believe it is a good allegory for psychological disarming (distraction, plausible alternative explanation, timing, etc).
Reading the original comments on the YouTube page is also entertaining. For instance:
"This is awful advice. Someone pointing a gun at you is either going to shoot you, or they are using it to rob you. If they are going to shoot you, they wont wait and stand around, they will shoot you as soon as they can. If they just want your stuff, hand over everything and be thankful that's all they wanted. This stuff could get someone killed."
Just be thankful that's all they wanted? This is sort of the advice I frequently give "victims" of sociopaths -- leave them alone. I don't think I ever tell them to be "thankful that's all they wanted," though. I find that sentiment to be rather depressing, or I should say indicative of a rather depressing existence.