Bruno: I have the perfect weapon right here: these two hands.

Bruno: My theory is that everyone is a potential murderer.

Anne Morton: How did you get him to do it?
Guy Haines: I get him to do it?
Anne Morton: Bruno Anthony. He killed Miriam, didn't he? It wasn't you, it was him.
Guy Haines: Yes...
Anne Morton: Tell me the truth, how did you get Mr. Anthony to do it?
Guy Haines: I didn't. He's a maniac. I met him three weeks ago on the train to Metcalf. We got to talking and he came up with this crazy idea about swapping murders. He does my murder, I do his.
Anne Morton: What do you mean "your murder"?
Guy Haines: He read all about me in the newspapers and magazines. He knew about me, Miriam, and you. He told me that if he were to get rid of Miriam so I would be free to marry you, I should kill his father so he could be free of him.
Anne Morton: But you should have known that he was only talking nonsense.
Guy Haines: But he wasn't! And now he's after me to see I fulfill my end. Now, a lunatic wants me to kill his father.
Anne Morton: Incredible.
Guy Haines: I know. I wouldn't have given it a second though had I known about what he had planned and done.
Anne Morton: Wait... you mean, you knew about Miriam this whole time?
Guy Haines: Since that very first night. He showed up at my place and gave me her glasses.
Anne Morton: Why didn't you call the police right away? Why didn't you turn Bruno in right then?
Guy Haines: And have the police say to me the exact same thing you just said? "Mr. Haines, how did you get him to do it?" Bruno will tell them that we planned it together... on the train.

Mrs. Anthony: Well, I do hope you've forgotten about that silly little plan of yours.
Bruno Anthony: Which one?
Mrs. Anthony: About blowing up the White House.
Bruno Anthony: Oh, Ma, I was only fooling. Besides, what would the President say?
Mrs. Anthony: You're a naughty boy, Bruno.

Mrs. Cunningham: You know, I read of a case once. I think it would be a wonderful idea! I can take him out in the car, and when we get to a very lonely spot, knock him on the head with a hammer, pour gasoline over him and over the car, and set the whole thing ablaze!
[giggles]
Bruno Anthony: [scowls] And have to walk all the way home? Oh, no.
Mrs. Cunningham: [meek] No? Oh...
Bruno Anthony: No, no. I have the best way, and the best tools.
[raises hands]
Bruno Anthony: Simple, silent, and quick - the silent part being the most important. Let me show you what I mean. You don't mind if I borrow your neck for a moment, do you?
Mrs. Cunningham: [simpers] Well... if it's not for long!

Guy Haines: Doesn't that bloodhound ever relax? He sticks so close he's beginning to grow on me - like a fungus.

Guy Haines: I may be old-fashioned, but I thought murder was against the law.

Guy Haines: It's pretty late to start flirting with a discarded husband.

Guy Haines: You crazy maniac! Would you please get out of here and leave me alone?
Bruno Anthony: But Guy... I like you.
[offended, Guy punches Bruno in the face]

[first lines]
Bruno Anthony: I beg your pardon, but aren't you Guy Haines?