You know the scene:
Kid finds a sound he/she likes. Makes said sound over and over. Mom and dad listen patiently for a bit. Kid keeps making new sound. Mom and dad hope kid gets tired of making it (silly mom and dad). Kid keeps making new sound. Mom or dad can't take much more and must put an end to new sound before ears fall off. Sound stops...but reappears at later times throughout the rest of their lives.