Size Doesn't Matter

A serving size is one of the few facts you can negotiate with. Serving size = 1/4 package? Not if you eat the whole thing in one sitting, it's not.

Sometimes you space out and eat way more than the suggested serving without intending to do so. Suddenly it's an hour later and you've eaten the whole box of saltines, designed to serve 10. This happens less frequently with non-food. Not often do you drive 10x farther than you need to go, or have sex 10 times in one evening.

The sex example is especially illuminating, as that's usually a 1/2 serving affair (self-service) at best.