I was making a little lidded box in spalted beech. All was going well enough but as I came to hollow the lid I managed a nasty catch which sent it flying and damaged the finished exterior. I gave up in frustration at having gotten so far and then irrecoverably screwed up.
Or so I thought at the time, it was certainly true of my skill level and experience at the time that I could see no way to fix what I had done. However I came back to it with fresh eyes and new experience and realised that I could at least try to recover the piece.