Gave Aged Aunt a flight in a Chipmunk to another airfield, on departure used up the two remaining cartridges for starting. Primed, set brakes, put Aged Aunts' left hand on slightly cracked throttle with instructions to pull BACK if the engine started. Swung it myself.
Had visions of Aged Aunt getting airborne !
Got away with it. Aged Aunt never knew that that wasn't what flying was all about. Thoroughly enjoyed her flight from Croydon to the Isle of Wight and back - in 1957.