Total loss at Toronto of Air Canada DC8-63, CF-TIW on Jul 5 1970 was caused by aircraft dropping after accidental deployment of spoilers by First Officer at 50ft. The Captain reacted immediately (within 1/2 sec) by retracting spoilers and opening throttles but owing to 6/7 sec spoolup time, the aircraft hit the runway very hard, causing outside starboard pod to be torn off, causing fire and loss of control.