When I lived in Vegas some genius decided to try an armed robbery at on of the gun stores on the Strip.
90% of the customers, which included a few off duty, and at least one fully uniformed on duty Metro Officer pulled down on the guy and a very, very short firefight ensued. He was hit almost 2 dozen times, and of course... Lived.
Not sure how much blood he had left in him when they reached the hospital but the stupid bastard lived through the experience.
