Place it as the reaction beat right after the favour is shown, then follow it with Awkward Moment to let the gratitude hang, or lead in with Anime Ahh when the helper first appears. Keep it as a single beat in the middle of the edit, not as an opener or closer.
About this sound
This nine-second clip centres on the spoken phrase 'Oh I'm die, thank you foreva,' delivered as an exaggerated thank-you that sounds overwhelmed and melodramatic. It lands as funny and awkward, the kind of over-the-top gratitude that works when a simple thanks would feel too flat. Its humour comes from the contrast between dying and saying thank you forever.