Teens get a thrill from stunts like car surfing and "skitching" -- riding a skateboard being pulled by a motor vehicle -- but the risks are phenomenal.
"Injuries at those speeds can result in significant neurological disability and even death," neurologist Dr. Alan Cohen told CBS Evening News (watch the full report below).
From 1990 to 2008, 58 people died in car surfing and 41 were injured, per a CDC report.
The personal impact of such accidents can be enormous.
"It was a mess, a mother's nightmare," said Sharyn Lindsay, mother of 28-year-old Caleb Potter, who survived a car surfing accident but suffered severe injuries.