There is one speck of light in the whole 5-second-rule bullshit. It is a great way to determine who should be eaten when a group is forced to cannibalism on a deserted island. People that believe in the 5-second-rule are idiots.

Food gets floor-germs all over it in a fraction of a second. Not as much germs as are on your hands however. Most floors in western houses are clean enough not to pose any threat to your health, even if you were to lick them.

Look, I don't eat soup of the floor if I drop it, but everything half-solid is still fine to eat.