The 'não sei' clip comes from the Brazilian meme and WhatsApp audio circuit, where short voice notes saying 'I don't know' get passed around as comic dodges. With no confirmed original video or speaker attached, it spread the way reaction sounds do: short, instantly readable, and easy to drop into edits. It sits naturally alongside other confusion reactions like an awkward moment sting or a confused eh eh ehhh, which is why it keeps resurfacing in meme compilations and comment replies years after it first appeared.