Superintendent Sugden: [referring to the missing diamonds] They definitely only were missing, but only two people could have done it, and one of them might have done it as a joke.
Hercule Poirot: I have yet to meet anybody in this household that has even the most rudimentary sense of humor.
Simeon Lee: You don't look very tough.
Hercule Poirot: Hercule Poirot is a detective not a bodyguard, monsieur.
Simeon Lee: [Telephone rings] Hercule Poirot?
Hercule Poirot: Yes, it is I Hercule Poirot who speaks.
Japp: Ah, good morning. Mr Harry Lee, I presume?
Harry: And who are you?
Japp: Chief Inspector Japp, Scotland Yard.
Harry: Brought in the big guns, have they?
Hercule Poirot: Ah, chief inspector. You have been thinking again. I have warned you of this before.
Japp: Oh, well.
Japp: You've seen a ghost or something, Poirot?
Hercule Poirot: Chief inspector, I might just have done precisely that.
Tressilian: I've been feeling very queer. Very queer indeed.