Put it near the end of a festive edit, after a cheerful reveal and just before the reaction shot, so the shift lands on the viewer. Follow it with the Fail Sound Meme for a comic fall, or open with Clapping Sound to set up the celebration first.
About this sound
This short clip runs for just under five seconds and captures a deep, booming Santa-style laugh with a strange, snorting edge that makes it sound part festive, part animal. It feels jolly at first, then quickly turns odd and unsettling, like a cheerful greeting that has gone slightly wrong. That creepy twist is what makes it stick in your head.