hmm, I hope I can come up with a good one.

Sora and Kairi alone on Destiny Islands.

Sora: "Hey, Kairi, let me go get that paopu fruit. I have an idea."
Kairi: "Ok!"
Sora gets paopu fruit.
Sora: "Ok, Kairi open up, so I can feed it to you."
Kairi: "Ok!"
Kairi opens wide and Sora places the paopu fruit in her mouth.
*pop*
Kairi makes gagging noises.
Sora pulls out keyblade.
Kairi: "Geez, Sora, your keyblade went all the way down my throat! Plus, it tasted horrible! I thought you were gonna feed me with a paopu fruit!"
Sora: "Sorry."
The next day:
Riku: "omg the whole keyblade?! Dude, that's amazing!"
Sora: "Yeah, I must do that to her again!"

Oh, right, this would probably be a time that only Kairi would not want a keyblade to pop in Sora's hand. Sora was probably grateful that it occurred!