I have about 2500hrs in the C172 and still manage to scrape a big groove outa my sweede on the bleedingdoor catch on the bottom of the wing........ about once a week.
I used to fly a C206 on floats and on one occasion, after briefing the pax to stay on the float untill I got around the other side to assist them, onbe bloke decided he didnt require my help and jumped of the rear of the float. Well the tail caught him right in mid flight about the bridge of his nose and he landed flat on his back in about two feet of water bleeding profusly, his bikini clad lady friends (god I loved that job) were less than impressed with his egress and proceeded to tell him hat a goose he was, in front of every one. (most were rolling around in the sand with sore ribs by this stage)