Truancy, vandalism and drinking alcohol may seem exciting to some kids, but these actions can have severe consequences. One teen, Warren Messner, found out the hard way, and two other young men seem headed down the same dangerous path. Plus, don't miss the top five warning signs that your child is in trouble.

In 2005, 15-year-old Warren Messner and his friends happened upon an unsuspecting homeless man in the woods. What happened next was unthinkable and landed the teen in jail for 22 years. Dr. Phil cameras go inside a maximum security prison for the first televised sit-down interview with Warren, now 18.

Learn what Warren says motivated him to commit a heinous crime. 

Chris, 16, felt high school was a waste of his time, so he dropped out. His mother, Kerry, and stepmother, Lisa, say they're at their wits' end trying to cope with his aggressive ways. They say he assaulted them and stole their money, and they just discovered that he smokes marijuana.

Is it too late for the teen to change?

Janene fears that her 19-year-old son, Brett, could ruin his life by drinking and driving. Brett already has two DUIs and crashed three cars but doesn't think he has a problem. Dr. Phil urges Brett and Chris to spend a day at San Quentin, one of the country's most notorious prisons.

Will the young men accept the challenge?

Don't miss Part 2 as Chris and Brett enter prison for the first time!