Place it in the middle of a scene, after the question is asked and before the answer lands. Follow a failed attempt with a long brain fart, then cut to a bruh when the obvious answer finally appears.
このサウンドについて
This is a short thinking music clip, a light musical tune that plays while someone works something out in their head. It feels playful and a little puzzled, like a cartoon pause while an idea slowly forms, and it turns a slow moment into something funny instead of awkward.