Place it right after the suspicious action, not before it, so the line works as the payoff. Pair it with a shocked meme sound effect for the reaction shot, or follow it with the illuminati confirmed sound when you want the betrayal to feel like a full conspiracy reveal.
关于此声音
This is a 1.6-second voice clip of the Spy from Team Fortress 2 stating "I am the Spy" in a flat, confident tone. The humor comes from a master of disguise announcing himself out loud, which makes it feel smug, funny, and instantly accusatory. It comes from Valve's Team Fortress 2, where the Spy is the class built around infiltration and backstabbing teammates.