Place it right on the visual mistake itself, then follow it with the Roblox Oof for a bigger reaction or lead into it with a Pop sound effect for a clean setup before the payoff lands in your edit.
关于此声音
This clip is a very short vocal yelp spelling out a single sharp 'iuk' sound in under half a second. It feels abrupt and funny, like a tiny startled reaction that cuts in and is gone before anyone expects it, leaving a quick burst of surprise.