After getting upset that the Fuck It Guy laughed at you for not figuring out his stupid box, you might have 'accidentally' pushed him into a fire...
The fire instantly engulfed him and went out...
The green guy was gone, but all the ash was now turned into a rock, upon which sat a tiny green jade bean next to an egg seemingly made out of brimstone.

"What the fuck happened" You think to yourself, suddenly wondering if anyone is going to miss the guy.
You feel a little bad, so you decide to pocket both the egg and bean, hoping you can figure it out, hoping this has something to do with the stupid box, even though you know in your gut it doesn't.