Place it at the start of the accusation beat, then follow with a sudden suspense sting while everyone looks around, and close with a wrong answer game show buzz if nobody confesses to the prank.
關於此聲音
A short French voice clip, about five seconds long, of someone asking 'Qui a collé mon bureau ?' in a baffled, mildly outraged tone. It feels funny and accusatory at once, like catching a prank in progress and demanding the culprit step forward immediately.