I was involved in a very hard landing in a CH-46 helicopter (two rotor helicopter with a ramp in the back). We were heading back to base, none of us were strapped in. The helicopter was so full that me and a few others were laying/sitting down in the middle aisle. The helicopter lost hydraulics in the rear rotor. The second scariest thing I saw was watching the earth and horizon spin out the rear door as we were going down. The scariest thing was when the pilot stopped the spin. The helicopter tilted back from lack of lift in the rear and me and the rest of the non strapped in clowns on the floor began to slide towards the rear door. Not fun at all. To the pilot's credit, he got us on the ground in own piece with no more than a few bruises and some dirty underwear.
picture of CH-46