Sora and friends are having the musical in Atlantica.

Ariel: ...A musical for everyone to have a lot of finny fun...

POP!

The Keyblade popping into Sora's hand knocks the dolphin, who slams into the drummer, who loses a tentacle, which flies into Donald's face, which causes him to cast Thunderga in the whole area, which kills half of Atlantica's population.

Sora: ...Oops. I'm busted, right?