I don't mind admitting, ripped a wing off a nice shiny Grob 109 glider, had to land with a massive tailwind component due to a loss of height after an airprox during a winch launch, came in with way to much speed, induced a ground-loop to avoid a rather solid building, and the wing came off. Not my proudest moment. I was new to gliding then, and many years on, I'm glad to say my only incident. (I'm hopng saying my only incident doesn't jinx me, as I'm about five hours away from completing my PPL
)