The "five-second rule" is a common rule that suggests that food dropped on the ground can be picked up and eaten within five seconds without causing any harm. However, there are several other synonyms used for this rule that convey the same idea. Some of these synonymous phrases include the "three-second rule", the "ten-second rule", the "grace period rule" and the "floor food exemption law". All of these different terms are used to make light of a potentially embarrassing situation and allow individuals to still enjoy their food without feeling wasteful. However, it is important to note that the five-second rule is not scientifically proven and that bacteria can transfer instantly upon contact with the ground.