A White House Heritage High School student's mother said it's a miracle her son is alive after suffering a critical head injury while trying to reenact a stunt he saw on YouTube. In the stunt, the teen tried to run across the top of a car driven at about 10 miles-per-hour by his best friend. Cody Horn, 18, jumped on to the hood, but lost his footing and fell hitting his head on the road. He was knocked unconscious and had a large gash on his head. Horn was transported by Vanderbilt University Medical Center's LifeFlight in critical condition. He has since been released from the hospital and is at home recovering. He suffers from a concussion, a large cut on his head and possible swelling of the brain. "When they arrived on the scene, [Horn] was laying on the pavement unresponsive," White House Police Chief Pat Brady said."He was completely knocked out cold and had a big gash on his head," Brady continued.White House police plan to turn the case over to the Robertson County district attorney's office to decide if the teen's friend who was driving the car will be charged. Horn's mother told Nashville's News 2 that her son and his friend are good boys who made a bad decision. "[They] are like brothers," Kimberley Horn Fram said. "Adam did not do anything on purpose."She continued, "It was the spur of the moment and they did something very foolish."Fram thanked everyone for their outpouring of support and prayers, as well as urged others not to attempt similar stunts. "I hope and I pray that if there are any other teenagers out there that want to copy a foolish act they reconsider," she said. Chief Brady also warned others of the consequences of recreating stunts seen on the Internet or television. "If there is a lesson in this," he said, "it is 30 seconds of a bad decision can cost you your life."Chief Brady continued, "These kids, from everything we have heard, are great kids We have never had any trouble out of them."Fram said Horn could return to school in the coming days. He was up and walking for short periods of time. Robertson County School officials said students at White House Heritage High School, where both teens are seniors, were shaken by the incident. The assistant principal sent an e-mail updating all teachers about Horn's condition so they could update students who asked throughout the day. The school district did not comment further saying the incident was not school related.