Zoro: wait- who’s turn is it to pay?
Luffy: mmmm i think mine?
Usopp: No, you took my watch last week it’s mine.
Franky: Isn’t it mine? You gave me cola yesterday even though i wasn’t due for it until next week.
Sanji: doesn’t that make it mine since Usopp and you rigged the refrigerator to be Luffy proof.
Luffy: that’s why it’s mine, Zoro owed me a favor for giving him my allowance so he got the doors open for me.
Zoro: this is the exact reason the trade system went out of business. Nobody could remember who owed what.
Robin: it’s choppers turn.
Nami: which is why we keep track.