Teens play dangerous games and sometimes games that kill. When Kristina Fields received a call from her 13-year-old son's school in February telling her that he killed himself in the school bathroom, she was mystified, as Luie Fields was a happy kid. But like so many teens who may not realize they are risking their lives when playing games like "leap frogging," "daring drinking," and extreme selfie games, some pay the ultimate price. Was Luie playing the "chocking game" - a game that is suspected to be behind hundreds of deaths in the past decade? ABC News correspondent Elizabeth Vargas reports on teenagers who risk it all.