The concept of, upon an item such as a pot of coffee or bowl of pretzels being emptied, the person who emptied said item is entrusted with the duty of replenishing the goods previously kept therein. Lazy people will not kill things if they are too lazy to fill them, and douchebags will kill them without feeling they should be bothered with refilling them.

Never trust a person who feels above this law. For Example:

When you eat dirt for the first time and leave your family to build a shack in the woods