You are walking in your neighborhood and you see a stack of money lying on the ground. You look around and a woman is walking a few feet ahead of you and he is the only person around. You are faced with the choices of do you pick up the money, do you leave the money, or do you ask the woman if the money belongs to him? Your Id, Ego, and Superego will all make very different choices in this scenario.
Woah ! She drop a dollar. I should get it
EXCUSE me madam! I think you drop a dollar while walking.
After some internal debate, your Ego, or your sense of reality, tells you to pick up the money and call after the woman. If the money is hers, you are doing the right thing and if she tells you that the money isn't hers, then you get to keep the money.