Put this clip right after the reveal beat in a prank edit, starting with a shocked meme sound for the reaction, then this laugh, and finish with an oh no no no laugh if a second person joins in on screen.
このサウンドについて
This is a short clip, just under five seconds, of Wilker bursting into a distinctive, contagious laugh with no other voice or music over it. It feels gleefully mischievous and instantly lightens the mood, turning an ordinary moment into a joke everyone is in on, which is why that single laugh works so well as a reaction.