Place this clip right after the complaint line in your edit, before you cut to the reaction shot. Follow it with the Bruh Soundboard Button for a flat payoff, or precede it with the Emotional Damage Sound Button when the complaint is extra dramatic.
About this sound
This 12-second clip features a tiny, squeaky violin playing a sad, drawn-out tune as Mr. Krabs pretends to sympathize. It feels sarcastic and mocking rather than sad, turning a complaint into a joke about exaggerated pity. It comes from SpongeBob SquarePants, in the episode Squilliam Returns, where Mr. Krabs performs it for Squidward.