Place it after the fail itself in an edit, then follow with a roblox oof sound button for the victim's reaction or a nope meme sound button when they try to recover and fail again.
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A short two-second voice clip of someone delivering a blunt 'ha, loser' taunt in a mocking tone. It lands as smug and gleefully mean, the kind of quick jab that turns a small mistake into a bigger embarrassment for whoever is on the receiving end of it.