I wonder if all of the people that claim this have the total recall to remember that they've never actually fallen out. Or, like countless other incidental events in our lives, we just don't remember them falling out, hanging by the wire and us putting them right back in. Many of us probably can't remember the clothing we wore all day as recent as a few days ago.
With this new product, it will be different. When one of these falls out, it's going to fall to the floor. In a clear or accessible space, this will also be incidental. We'll put it back in and forget that it fell out. On the other hand, when it falls out and into a more inaccessible space (a crack between the seats, off the side of an escalator, into the bushes near where we were jogging, etc) and we have to invest some time hunting for it, odds seem higher we'll remember that kind of incident.