This is a very complex law of physics. It states that if food (goldfish, for example) is dropped on the floor, it can be "safely" eaten within five seconds. The five second rule is very fun to apply when in...say...architectural drawing class, usually when Mr. Johnson leaves the room.
When other people are attempting to throw goldfish in your mouth, but miss and hit you smack diddley doo in the face, the five second rule applies as soon as it makes solid contact with the floor.
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