Put it at the exact cut where the scene changes, then follow it with a Ba Dum Tss beat for the laugh or a Correct Ding when the joke is proved right, keeping the Thai line as the turn in the middle of the sequence.
About this sound
This is a very short Thai spoken clip, lasting about 1.7 seconds, built around a single familiar Na Khom voice line rather than a longer speech. It feels playful and suddenly cheeky, turning an ordinary scene into a light joke the moment it appears. Thai-speaking listeners catch the cue at once, which makes it work as a quick comic interruption in short edits.