4) If you suddenly realize that you are doing something you know the human's don't want you to do (say, fer instance, nibbling the edge of the table cloth), you can pre-empt punishment by dropping to your belly on the floor and covering your face with your paws in a gesture that clearly says "Oh! I'm a BAD puppy." Then, instead of saying "NO!" they will say "Oh! What a SMARTIE! Look at him!" and unload wheelbarrows full of love onto you.