I've only ever done one of these, but I'll open my mouth anyway. I was doing touchdown autos as a student, and I blew it. Was going to end up in the pit at the north end of the runway on the wrong side of the fence. The instructor told me to flare over the pit, hold 60, and milk the collective to clear the fence and touch down at 60. As I touched down, I could see the sparks flying in the chin bubble windows. It sounded really bad. I had no desire to drop the collective and grind it out any worse. The last 5 feet were really ugly as it finally ground to a halt. I leaned out the door and looked back, amused to see two smoke trails rising from the runway like something out of a roadrunner cartoon. The aircraft was an Enstrom F28A.
-- IFMU