It was a normal, sunny and nice day. Law decided to let his crew take a break for at least an hour and let them bring the submarine to the surface to enjoy some fresh air.
It was probably the first time you saw Law in a good mood. He even invited you to sit and chat on the deck, where you both talked about the most mundane stuff that could come to your minds. At some point you decided to tell him a few ridiculous and silly jokes, to which he would let a few chuckles out without much thought.
But it was at one specific joke, the most silly and stupid one you could ever tell him, that his chuckles would turn into a full laugh. One that you never imagined would sound the way it did.
"Ope-hehehehahahaha!!"
He would freeze as soon as he realized he just laughed out loud. He wouldn't even dare to look at you, and would just stare into the nothing with a dumb face.