This was during one of our rehearsals, and i still get it even today.
Our schools sousaphones are pretty old, and some of the bits doesn't properly fit nice and tight like they should, and during the end of the first part, my WHOLE mouthpiece came out with 1/2 of the bits attached (there was 2 bits). We still had 4 more parts to go, and while i welcomed the chance to improve my marching and dot accuracy, worse things happened.....
1/2 way twords the end of 3rd part, my dot book fell out of my pocket ( i didn't have time to throw it into my bags before the rep started), and i found out later that a color guard girl tripped over my nice and shiny silver mouthpiece. I still have the black mark to this day.