Place this clip at the end of a reaction sequence, after the mistake is already visible. Start with the Oh My God Meme Sound for the initial shock, then let this one carry the aftermath, or follow it with the Emotional Damage Meme Sound for a second hit.
Über diesen Sound
This is a heavily slowed voice clip lasting about eighteen seconds, with Seu Madruga stretching his Portuguese exclamation 'Nossa' until every syllable drags and his pitch sinks into a deep, wobbly drawl. It feels absurd and drowsy, turning simple surprise into drawn-out disbelief. It comes from Chaves, the Brazilian version of El Chavo del Ocho.