Place it right after the joke or fail that sets it up, as the reaction that closes the scene, then follow it with Baby Laughing Meme if you want the laughter to keep building. For a stranger, more chaotic cut, pair it before Goofy Ahh Sounds so the second laugh lands as an escalation.
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The Looolkek clip is a short, roughly two-second burst of exaggerated laughing built around the drawn-out 'lol' and 'kek' sounds, delivered in a playful, over-the-top voice. It feels gleefully silly and instantly light-hearted, like someone losing it over a joke that landed perfectly and wanting everyone nearby to hear just how funny it was.