Place it near the end of a fail montage, after a normal reaction has already set up the joke, so the reversed moment becomes the twist. Follow it with Goofy Ahh Sounds as the next beat, or put Scream Meme just before it to build from a familiar scream to the twist.
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This short clip plays a goofy human yell backwards, turning a familiar shout into a warped, rising squeak that sounds wrong in a funny way. At about two and a half seconds long, it feels silly, surprising and slightly unsettling, like a cartoon reaction played in reverse. It works best as a sudden, odd interruption rather than a normal shout.