{"Keep your feet and knees together or we'll be here forever, Sgt. Airborne"
My favorite was the one that went something like this:
Sergeant Airborne - "If your reserve parachute fails to deploy, do not panic. With your left hand, grasp the left carrying handle. With your right hand, form a knife cutting edge. Sweep up and away on the bottom of the reserve parachute. This should cause the reserve to deploy. If it does not deploy on the first attempt, repeat that motion until it does."
Me - "Sergeant Airborne, ... how long do you have to get the reserve to deploy?"
Sergeant Airborne (grinning) - "Airborne, you have the rest of your life."