Paul Gerard: When did you first suspect me?
Columbo: Well, after it happened, sir, about two minutes after I met you.
Gerard: That can't be possible.
Columbo: Oh, you made it perfectly clear, sir, the very first night when you decided to come to the restaurant directly after you were informed that Vittorio was poisoned.
Gerard: I was instructed to come here by the police.
Columbo: And you came, sir.
Columbo: After eating dinner with a man that had been poisoned. You didn't go to a doctor. You came because the police instructed you. You didn't go to a hospital. You didn't even ask to have your stomach pumped. Mr. Gerard, that's the damnedest example of good citizenship I've ever seen.