While listening to a recording of a high school and college orchestra concert, my ears caught one surprising intonation error that I didn't remember hearing during rehearsals. Immediately after the wrong note, I heard what sounded like a sharp snap on the tape. Most likely, the conductor didn't break the baton in half, walk off the stage in the middle of the William Schuman piece, decide to give up on conducting, and go live in the woods, where he wouldn't be held responsible for students' out-of-tune playing. Most likely, he hit the stand with the baton...
...At least, I'm fairly certain that's what happened--maybe...