I know that you all do this.
The rule of the "last one" plays out daily at the office. There is always one mint left in the jar, one cookie on the plate, or, in this case, one piece of cake left in the box (see pic). Are you kidding me? How hilarious is this picture?
This is the problem. Stick with me here. When you take the second to last one, you are, in fact, taking the "last one." Why? Because nobody is going to get to eat anymore now that the second to last one is gone. For example, in this picture
Do you see my point? The point is that NOW I can't even eat the second to last one because then I am, in essence, eating the last bite because nobody is going to eat the "last one."
Don't believe me? Try it out. Keep eating the second to last one... at holiday parties, at office parties, and at home (depending on your housemates) and see what happens. The "last one" just sits there and rots! If you try this then leave us all a comment on how it worked out.