This is a long one, but at the time, I thought quite classy.
Ft. Bragg....Headquarter's Battery XVIII Airborne. Company formation
First Sgt.: Any questions?
Newbie, Buck private: "Sgt. what happens if my main chute fails to deploy"
First Sgt.: "Outstanding question. Listen up everyone.
Immediately spread your legs forming an Isosceles triangle. With both hands, fingers extended and joined and pointed at the center of the triangle's base, bend forward until the center of the top of your head is positioned on the center point of the triangle's base. Immediately tuck your head up 45 degrees while grasping your buttocks with both hands and kiss your ass goodbye".
First Sgt.: Any more questions?
Gunnery Sgt Hartman (Full Metal Jacket) is the finest I have seen on film. Sheer poetry!