Murder on the Orient Express (1974)
Michael York: Count Andrenyi
Countess Andrenyi : As is my custom on night trains, I took trional.
[Poirot makes a noise and looks at the doctor]
Dr. Constantine : Diethylsulphone dimethyl methane. One dilutes the white crystals with water. It is a strong hypnotic.
Countess Andrenyi : Ha, ha! He makes it sound like a poison!
Dr. Constantine : As with most sleeping drugs, if taken in sufficient quantities it IS a poison.
Count Andrenyi : [jumping up] You are not-!
Hercule Poirot : Ah, you are not *accused*... you are *ex*-cused! Thank you both for your help and cooperation.