Place it at the start of a reaction beat, just before the on-screen character looks up, then follow it with the shocked sound once the confusion lands. For a longer prank, add the smoke detector beep later as a second false alarm that keeps the room guessing.
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This is a brief digital ping lasting just over a second, the alert heard from the wristwatch menu in Rec Room. It feels like a genuine device alert, so listeners instinctively glance at their own phone or wrist expecting a message. That false-alarm jolt, followed by the realisation nothing arrived, makes it funny and surprising in a room or video.