Put it at the impact point of a fail edit, after a short wind-up and before the reaction shot, then follow it with Metal Pipe Clang for a second hit or SpongeBob Fail to underline the joke.
關於此聲音
This is a roughly two-second effect of a brick scraping and striking metal, with a gritty scrape followed by a sharp clang and a rough, mechanical edge. It feels jarring and awkward in a funny way, like a cheap industrial accident interrupting a clean moment, and it lands best as a blunt, ugly punctuation for a fail.