What rule do you follow when food falls on the floor? The 5 Second Rule? Does it depend on where the floor is, whether it's indoors or out, whether it's your floor or someone else's, whether it's carpeted? Does it depend on how good or how expensive or gooey (or Mike-and-Ike-like) the food is? How hungry you are? Or does it depend on who's watching?
And what do you think when you watch other people following their food-on-the-floor rules? Do you like them best when their rule is closest to yours, and if you dislike them when they deviate from your rule, do you dislike them more if their rule is laxer than yours or if it's more stringent? Do you admire someone with a higher (or a lower) standard?
If someone else's food falls on the floor, do you encourage them to eat it, maybe by yelling "5 Second Rule!"? If you're one of those people who say "Don't eat that, it fell on the floor," are you afraid they'll think you're squeamish about everything and no fun at all or do you feel good about the noble public health service you're performing?