Law: why is straw hat-ya rolling around on the ground screaming?
Usopp: oh he was eating pop rocks and I dared him to drink some cola.
Law: and he thought it would end well?
Luffy: it’s like fireworks in my mouth!
In addition to this:
Robin: why is chopper rolling around on the ground screaming?
Law: well he saw luffy doing it and said and i quote “it can’t be that bad luffy” so Usopp dared him to do it…
Usopp: and we’ve come full circle