My son was on my account on a friend's multi-player server and made a firework.

After activating the firework, connection was lost and we could not reconnect with either of our accounts.

1. Firework Rocket made whilst playing on multiplayer server
2. Firework Rocket set down
3. Kicked off server
4. Unable to reconnect, and thought connection was lost forever.

Connection seems restored 10 minutes or so later, though it was reading some sort of Connection Error before that.