Dr. Jekyll and Mr. Hyde (1931)
Dr. Lanyon: Perhaps you're forgetting, you're engaged to Muriel.
Dr. Jekyll: Forgotten it? Can a man dying of thirst forget water? And do you know what would happen to that thirst if it were to be denied water?
Dr. Lanyon: If I understand you correctly, you sound almost indecent.
Dr. Jekyll: What names you give things!
Blond-haired student: [joking to another student about Jekyll's lecture on splitting the personality] Why don't you stay at home and send your other self to the lecture?
Poole: You should go out, sir. London offers many amusements for a gentlemen like you, sir.
Dr. Jekyll: Yes, but gentlemen like me daren't take advantage of them, Poole. Gentlemen like me have to be very careful of what we do or say.
Mr. Hyde: Perhaps you prefer a gentleman. One of those fine-mannered and honorable gentlemen. Those panting hypocrites who like your legs but talk about your garters.
Dr. Lanyon: You're a rebel, and see what it has done for you. You're in the power of this monster that you have created.
Dr. Jekyll: I'll never take that drug again!
Dr. Lanyon: Yes, but you told me you became that monster tonight not of your own accord. It will happen again.
Dr. Jekyll: It never will. I'm sure of it. I'll conquer it!
Dr. Lanyon: Too late. You cannot conquer it. It has conquered you!
Mr. Hyde: If you do one thing I don't approve of while I'm gone, the LEAST little thing, mind you... I'll show you what horror means!
Dr. Jekyll: Oh, God. This I did not intend. I saw a light but did not know where it was headed. I have tresspassed on your domain. I've gone further than man should go. Forgive me. Help me!
Dr. Jekyll: I have no soul. I'm beyond the pale. I'm one of the living dead!
Mr. Hyde: [after strangling Ivy] Isn't Hyde a lover after your own heart?