http://www.theinvisiblegorilla.com/ <~~~(Required Linkback In Order To Post These Here)
These are not directly firearm related but are very applicable to the awareness (or lack of it) of the general population.
The human brain filters out so much of what is not specifically being paid attention to. Folks just DO NOT see the things that you believe they MUST be noticing.
Watch The VIDS.
And The Best One Yet.