I’ve been thinking about devil fruit abilities, specifically devil fruit Awakenings. Thinking back to islands such as Punk Hazard where two very powerful devil fruit users fought and permanently changed the islands environment.
Turning one side of the island into a fiery hellscape & the other to a frozen tundra, as well as Raijin Island where it’s suspected to have been affected by a previous Goro Goro no Mi user because of the constant lightning raining down on it.
Could it be the case that Joy Boy left behind a similar effect on Laugh Tale, where when the Roger Pirates arrived they couldn’t help but laugh at whatever was going on there?
With the Gorosei stating that Joy Boy had the Hito Hito no Mi, Model: Nika and it supposedly being only limited by the power of the imagination of the user to put smiles on people’s faces.
Maybe besides the incredible treasure and story left behind in Laugh Tale, there’s also an overarching feeling of Joy surrounding the island because of Joy Boy’s influence.
*Theory by mserrato