Saw a virtually identical incident with a Bonanza 36 at Oshkosh a few years ago. No failure, just badly flown. I videod it to discover that my film consisted of very jerky grass, and an American voice saying 'Holy sh.t Get out of the way, get out of the way!!' as it groundlooped towards us. Some undercarriage damage on that one, and a passenger who probably will not fly with that guy again!!.