Place this clip at the start of the confrontation, then follow it with a shocked reaction. A shocked sound works right after the accusation, and Why Are You Running can close the scene as the accused tries to escape.
About this sound
This is a short Italian voice message, about eleven seconds long, in which a man addresses Alessandro directly and tells him he knows what he did. The plain, pointed delivery feels tense and unsettling, like being caught mid-secret. It reads as a playful accusation rather than a real threat, which is why it works for pranks that need sudden suspicion before a reveal.