Put it at the peak of a reveal, after the setup has played out and just before the reaction shot. Follow it with Awkward Crickets after the reaction fades, or finish a bigger gag with Boom Headshot as the final payoff after the zoom lands.
About this sound
A low, heavy thump that arrives in just over a second and drops away fast, built around one deep bass hit. It feels sudden, silly and overblown, turning a plain look or pause into a joke that lands with weight. Known as the Vine boom, it grew out of Vine-era meme edits and stayed in use for reveals and reaction clips.