The phrase existe um negócio desse is a common colloquial expression in Brazilian Portuguese used when something seems too strange to be real. As a standalone soundboard clip it circulates mainly as a quick reaction audio, shared in messaging apps and short videos where a Portuguese speaking audience will catch the meaning instantly. Its popularity comes from how flexible the line is, fitting everything from strange coincidences to over the top stunts, and from how clearly the tone communicates disbelief even to viewers who do not speak the language fluently at all.