Speak of the devil. 说曹操，曹操到。
本句是一句老话，但却仍是常用的话。在讲话中提到某人时，该人正好出现，这时就可以用这句话来欢迎他的出现，比单纯的 How are you? 或 It's you. 好多了。
1. Speak of the devil. We were just talking about you.
2. Talk of the devil!
3. A:Speak of the devil.
B:Why? What were you talking about me?
A: Well, speak of the devil.
B: What do you mean?
A: I was just thinking about you the other day.
B: You were?