While practicing auto rotations during a military night
training exercise a Huey Cobra screwed up the landing and
landed on the tail rotor.

The landing was so hard that it broke
off the tail boom.

However, the chopper fortunately remained
upright on its skids, sliding down the runway doing 360s.

As the Cobra slid past the tower, trailing a brilliant shower
of sparks the control tower radioed the chopper.

Tower: "Sir, do you need any assistance?"

Cobra: "I don't know, Tower. We ain't done crashin' yet."