The clip comes from Ace Ventura: Pet Detective, the 1994 comedy that made Jim Carrey a star with his rubber-faced performance as the eccentric animal detective. His short sarcastic laugh became a reusable reaction separate from the film, spreading through soundboards, edits, and meme videos where a fake laugh says more than words. It sits alongside other cartoonish reaction laughs like the Woody Woodpecker Laugh, but Carrey's clipped delivery and smug timing keep it tied specifically to mocking someone who thinks they were clever.
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Jim Carrey's short sarcastic laugh as Ace Ventura, the exaggerated heh-heh used as a mocking reaction to bad jokes, fails and obvious lies online.
This is Jim Carrey as Ace Ventura delivering a short, deliberately fake laugh that lands in under two seconds. The sound is a tight string of clipped heh sounds, pitched with obvious sarcasm rather than real amusement, like he is humoring someone while thinking the opposite. Because it is so brief and pointed, it cuts straight through a scene and turns a weak punchline or stupid mistake into the joke itself. Viewers instantly read it as mock approval, which is why the clip works even without any picture attached.