Place it at the end of a helpful moment, after the favour is shown, so it works as the closing beat. Open with Oh My God Wow for the surprise, then let this clip answer it, and finish with Kids Cheering to lift the whole thank-you into a small celebration.
About this sound
This is a short voice clip of about one and a half seconds in which a speaker repeats the Portuguese phrase for thank you very much twice, with the second thank you landing as a warmer, more emphatic echo of the first. It feels sincere, cheerful and politely over-the-top, like a grateful nod that keeps going just long enough to make someone smile.