[Death by Mirrors]

@Ava: This one:

Originally Posted by Coda

For anyone who wasn't around for the New Year's event, you can still see the fireworks animation even if you don't have any rockets of your own: https://trisphee.com/games/fireworks/

It was part of a different event, and you could watch it when you used a rocket (which was a rig item pretty much like the birdday box). Coda's link allows you to view the animation.