Interesting/funny story. I don't have as many gliding hours as powered (not unusual) but have a silver c and have been gliding through four decades. Two instances spring to mind, K18 on approach, popped the brakes and the brake handle came off in my hand; not just the handle but the whole shebang. Landed OK, still pulled back on the handle that was hanging loose in my left hand....old habits etc.
Second: ASW 19 flying a bit near a very large CB, no comments thank you, full brake and Vne, still going up, only time I've ever considered taking to the 'chute except I knew I would probably go up faster in the 'chute. Got out of that by spinning it out. Bottom clenching moment.
Other than that, the usual stuff that glider pilots go through.