"Teenagers! Dey tink dey know everyting!" proclaims Sebastian, the "guardian" crab of 'Ariel', the Little Mermaid in Disney's film of the same title. "And isn't that the truth!" most parents of a teenager respond with despair. .For many parents and their teens, adolescence is a period of upheaval and conflict. A child who was once cooperative and communicative suddenly becomes opinionated, withdrawn, and rebellious. Parents often wake up one morning to find themselves totally bewildered about how to handle this "stranger" who used to be their child.