One time, never forget it. Was just finishing off flute practice when the dog started screaming. Had to run to find out what the matter was, so put the flute across the stand (one of those black ones with the holes in the back!) and ran out to see what the story was.
Found Allegro, dealt with him and went back in to find Mum white-faced and shocked .. Having knocked said flute onto ground. Put it together, and found that footjoint did not work ...
This caused a slight problem because I had the Junior Concerto Competition the next day

This was 8pm at night, and I was on at 10am.
Rang around desperately, eventually found the number of a guy about 25mins drive away that fixes 'band' instruments. Got onto him, explained and he said come on up.
He terrified me. He had a pipe, lit it, inhaled the smoke and then blew it through my flute. When he found where the leak was, he pressed down hard on the keys, I was so scared that they were going to snap right off. But ... he fixed it. Played more beautifully than it ever had done before ... And .. only charged us a fiver
Alls well that ends well, though I've never put my flute back on the stand ever again.