Hey, Oguri-san, riddle me this!

What kind of bun is a bun but caaaan't be eaten? Original uses pan, i.e. "bread".

A bun you can't eat? Does that even exist?

Maybe a bun that has already been eaten... or something?

"A rusted frying pan", playing on "pan" meaning both bread and pan in Japanese.

I see! That can't be eaten, right!

Pretty funny. Heh.

You think so too, ehhhh? Hehe.♪

Original uses "rusted". Note that the original pun doesn't have "rusted" in it, so... yeah.