Chara should stop, should say something, but the other Chara's strained shrieking just sounds so funny that whenever they try to rein themselves in the laughter just sets itself off all over again.

They laugh. They laugh and laugh and laugh and laugh, building from tiny giggles to shoulder-shaking guffaws. Their stomach aches, their chest burns, and their throat grows sorer and sorer but they can't stop.

It's an indeterminate amount of time before their laughter finally starts to subside, tears and snot streaming down Chara's face and around a rictus grin. Air still wheezes in and out of their throbbing lungs. Distantly, they observe that they've started hyperventilating; they must have run out of air during that laughing fit.