I have witnessed 3 crashes
The first was a C 172 that touchdown nose wheel first and then continued bouncing until after the 4th nose wheel first hit, the nose wheel strut broke off. The aircraft was also quite crooked at this time so it departed the side of the runway and ground looped when a wing tip dug in. Nobody hurt but the aircraft was wrecked. The wind was right down the runway at about 5 kts
The second was when a pilot landed his Arrow wheels up. He had not flown for several years but declined several suggestions that he should do a bit of dual with an instructor.
The third involved a low level EFATO in a C 185. The engine failed without enough runway to stop. It went off the end of the runway and then groundlooped with heavy damage. The engine failed because the fuel was turned off and the fuel in the collector tank was exhausted.
3 wrecked airplanes that were 100 %, totally, absolutely preventable......