Place it at the very end of a reaction sequence, after the claim it answers. For a back-and-forth, put the You What SpongeBob Sound first to show confusion, then finish with this clip as the non-answer.
关于此声音
This 0.8-second clip is Perceval saying 'Ouais, c'est pas faux' in a flat, resigned French delivery. It feels dry, evasive and quietly funny, like half-agreeing while admitting you are not fully convinced. It comes from the French comedy series Kaamelott, where the line became Perceval's signature reaction.