When I was a kid, I was in band class. We were having an end of the year big concert and my parents were coming for once. I was first chair and had a fun part in one of our songs so I was really excited to get to play for them for once.
Because of my excitement and my being just a kid, I was bouncing around and the neck strap for my saxophone broke. I played tenor and there was no way my little hands could hold that thing up for a whole concert, so I was pretty much booted from the concert last minute. It broke my damn heart. Even thinking about it now makes me teary. All that hope just quashed because of some dumb mistake.
Good news is that the band director did me a solid and let me walk out with my case to rest my sax on beside my chair, but the damage had already been done.