On the same firework theme . . .
I once attended a friends bonfire/firework party in his field and took responsibility after the fireworks were finished of gathering up all the spent firework rubbish to leave the place tidy. Included in the accumulated trash was the rather large 'box' remains of one of those multi shot type fireworks that fires a large number of individual small rocket type fireworks sequentially. In the dark I failed to notice that the device had not fully 'fired' and a significant number of the individual rockets were still intact. This didn't matter at all until I threw the rubbish on the still burning remains of the bonfire surrounded by a crowd of onlookers. Cruel luck determined that the box landed on its side and began launching rockets horizontally. The crowd were initially startled and then horrified as burning projectiles hurtled towards them from the burning embers.
Thankfully no one was hit and I can look back in amusement at the chaotic scene of people diving for cover and frantically running in all directions. I'm sure for many it was the most memorable bonfire they've ever attended