A court has warned kids not to play on moving cars after hearing about the death of a 10-year-old boy who fell from the back of a moving lorry.
Jordan Lee Widdall-Hughes, from Newport, Wales, suffered bad head injuries in the fall.
An inquest, which investigates someone's death, was told Jordan and two friends had climbed onto the top of a moving lorry in April.
The court heard it was a miracle Jordan's friends weren't hurt too.
David Bowen the coroner, who's in charge of an inquest, said Jordan must not have realised how much danger he was putting himself in.
"Jumping on moving vehicles is unacceptable, dangerous and potentially fatal," he said.
Mr Bowen recorded a verdict of accidental death, which means Jordan's death was an accident.
Roger Vincent, from the Royal Society for the Prevention of Accidents (Rospa), said he had heard of kids holding on to cars, trains and buses.
He said: "Parents should explain potential risks and the consequences of their actions - not just say they cannot do something and frighten them."