May: John£¬ you smoked again today£¬ didn't you? John: What? No! May: You can't lie to me£¬ because I can see through you. John: How on earth did you know? I can't believe this. I smoked just one cigarette and you found it out! I don't think you can smell it. Did someone tell you? May: No. I told you. I can see through you. John: Come on. Tell me how you found it out. May: Actually£¬ it was just a shot in the dark. You looked kind of guilty when you saw me. John: Gosh£¬ you really are perceptive.