A prank gone wrong left a young Taihape man near death after a fire extinguisher went off in his face.
The 20-year-old struggled for breath as St John paramedics rushed him to the Taihape airfield.
The Palmerston North rescue helicopter flew him to Wanganui Hospital.
The man's condition was status one when paramedics began treating him, the most serious condition a live patient can be in. (Status five means the patient's condition is minor.)
He was status two by the time he was en route to the hospital.