That's a good point -- I never thought of that possibility until you mentioned it. That probably would have been the perfect opportunity to ambush someone like that.
I just thought that it was an interesting perspective of the state of the world. It's far too easy to take things for granted sometimes.
The headphones make it unbelievably worse. I'm not normally a skiddish or easily frightened person, but the one that got me startled the hell out of me. If you are unfortunate enough to have headphones on when you get one of these (as I was at work), trust me , much more effective.
By the way, nice video to put things in perspective. Much too much taking things for granted these days. Need to take the blinders off occasionally.