The problem with Pringles is that they end up defeating you every time you pop the can open. You intend to chow down on a few chips -- a quick snack -- and then before you know it, you're three-fourths of the way to the bottom. Not wanting to face the disappointment of later opening up a one-fourth-full Pringles can, you proceed to devour the rest of them. Quickest 800 calories you'll ever eat.