It looks as though this customer has fainted. Also known as syncope, fainting is a temporary loss of consciousness. It happens because there isn’t enough oxygen-rich blood flowing to the brain, which can happen for a number of reasons. The key signs are a lack of responsiveness; skin that is pale, cool and sometimes a bit sweaty; and a slow pulse. Just beforehand the individual may experience confusion, lightheadedness, visual and aural disturbances, altered breathing, nausea, yawning or a sense of panic. 

Falling to the floor is the body’s way of coping. With the head at the same level as the heart, gravity doesn’t get in the way of pushing blood to the brain. Consciousness is usually regained after less than a minute, and anything that lasts longer than two minutes warrants urgent medical attention. The patient does not usually suffer any ill-effects other than any injuries sustained from the collapse, a mild sense of disorientation and tiredness for a while.