You shouldn't get back at children.
Laura has spent hours trying to find her keys that were hidden by her brother John, and Laura sees John's toy on the floor.
Laura wants to show John the consequences of his actions.
Laura talks to John about how his actions impacted her day.
Laura teaches John by placing him in a similar position to her by hiding John's toy.
John understand Laura, and he doesn't hide her keys ever again.
John starts crying because he can't find his toy.