'Usopp is an idiot! ' Luffy announces into the tone dial.

'Heh?! What did I do?! ' Usopp cries.

Conis giggles at their antics. 'Now press the apex of the shell. '

'What an apex? ' Luffy asks, turning the shell upside down.

'The top pointy part, ' Usopp points out.

'Usopp is an idiot! ' Luffy 's voice announces out of the dial.

'Heh?! What did I do?! ' Usopp 's voice cries. Conis 's giggle sounds out of it next.

'Woah! This shell made fun of Usopp! ' Luffy yells. I burst out laughing.

'So this is a dial? ' Zoro asks.

Conis nods. 'Yes, they 're a type of shellfish that live in the White White Sea. This one specifically is called a tone dial, we mostly use them to record music. '

Usopp hums, poking the shell again and making a face when it makes fun of him. Then he turns to me. 'You think they have music from where you 're from recorded? ' Usopp muses.