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, this was the radio
exchange that took place...

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

Cobra: "I don't know, tower, we ain't done
crashin' yet."