Put it at the start of a missing-person gag, right before the camera finds the empty seat, then follow it with Law and Order Dun Dun for the reveal and Woody Woodpecker Laugh when Alvin turns up hiding nearby.
關於此聲音
This 1.2-second voice clip asks, in Portuguese, where Alvin is, delivered as a quick, searching call that sounds like someone has just noticed an empty chair. It feels playful and a little exasperated, the kind of light teasing that lands when a friend has slipped away unnoticed. It comes from SBT television.