An Irish schoolboy had a heart attack after his testicles were squeezed in a prank that went horribly wrong.
 
The 17-year-old has been placed in a medically induced coma, following the incident in a suburb of Dublin.
 
The pupil was heading back into school after a lunch break and joking around with a group of boys.
 
One of his friends then "jerked his scrotum," causing the emergency.
 
A teacher and one of the group performed CPR at the scene while waiting for the emergency services to arrive.
 
A source close to the boy's family said they believe it wasn't a "savage attack" or carried out in a "malicious way."
 
The teenager is said to be in a stable condition.