Dr. Jekyll and Mr. Hyde (1931)

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!

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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!

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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.

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The remarkable Jekyll-to-Hyde transition scenes in this film were accomplished by manipulating a series of variously colored filters in front of the camera lens. Fredric March's Hyde makeup was in various colors, and the way his appearance registered on the film depended on which color filter was being shot through. During the first transformation scene, the accompanying noises on the soundtrack included portions of Bach, a gong being played backwards, and, reportedly, a recording of director Rouben Mamoulian's own heart. Only in the late 1960's did Mamoulian reveal how they were done.
Miriam Hopkins originally turned down the role if Ivy Pearson, saying she wanted to play Muriel Carew instead. She soon changed her mind when the director informed her many actresses in Hollywood could be cast in her place.
The sound of the pounding heart in the transformation scene was Rouben Mamoulian's own, recorded after he ran up and down the stairs for two minutes.
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