Place it at the exact moment of discovery in a prank edit, then follow it with the shocked meme sound for the reaction and the why are you running sound as the speaker flees the room.
About this sound
This short Russian voice clip delivers one panicked line in which a speaker warns that his mother will cut off his testicles if she finds out what he has done. The blunt threat lands as crude, awkward humour, turning a moment of fear into a laugh because the punishment sounds far worse than the trouble. It works best as a shocked reaction to getting caught.