Place this clip at the exact moment a prank target turns away, then follow the confused pause with the Crazy Realistic Knocking Sound for a second attempt. Follow that with a laugh track sting to close the sequence and reset the scene.
關於此聲音
This is a 12-second clip of sharp, repeated knocking on a door, played as a troll effect with no voice or music. It feels sneaky and startling in a funny way, because the knock sounds close and urgent enough to make listeners turn around, check the door, and realise nobody is actually there waiting.