Zombies and the Five-Second Rule
As it turns out, even zombies abide by short-term food contamination avoidance standards.
“The five second rule is a popular polite fiction regarding the eating of food that has fallen to the floor or ground. The origin of the rule is unknown. The substance of the rule is that if food falls on the ground, it may be safely eaten as long as it is picked up within five seconds.” Explosm.net via bookmole