Sure, more cowbell is never a bad thing, but in this particular case, eyes in the back of their tuba players' heads would have been more useful. That, or some shoes with a bit more traction, so as to avert this marching band pileup.
The hilarity starts about 5 seconds into the video, when a set of tuba players begin marching backward. One player at the rear of the group stumbles and falls to the ground. One by one, they all walk backward, blissfully unaware of the downed musician behind them, until almost the entire section has tripped and fallen to the turf.
To their credit, the players recover quickly enough to climb out of the horn heap and keep marching, though it appears they did so to the (ahem) beat of their own drummer.
According to the video's uploader, no one was hurt, "but two tubas did get damaged."
WATCH: The full video.