The Pearl of Death (1944)
Dr. John H. Watson: How does the, the thing work?
Sherlock Holmes: Electricity. The high priest of false security.
Sherlock Holmes: This man pervades Europe like a plague, yet no one has heard of him. That's what puts him on the pinnacle in the records of crime. In his whole diabolical career, the police have never been able to pin anything on him. And yet, if there be a crime without a motive, I'll show you Giles Conover! If I could free society of this sinister creature, I should feel my own career had reached it's summit.
Sherlock Holmes: I don't like the smell of you - an underground smell, the sick sweetness of decay. You haven't robbed and killed merely for the game like any ordinary halfway decent thug. No, you're in love with cruelty for it's own sake.
Sherlock Holmes: [to Watson] My dear chap, I really must caution you against hitting newspaper reporters in the teeth...
Dr. John H. Watson: Lestrade couldn't even see the stripes on a zebra.
Sherlock Holmes: Watson, look sharp, will you? Go to that door to the alley, and do exactly as I tell you.
Dr. John H. Watson: Huh?
Sherlock Holmes: No, not "huh". Just do it.
Dr. John H. Watson: The Borgia pearl is inside that?
Sherlock Holmes: If it isn't, I shall retire to Sussex and keep bees.
Dr. John H. Watson: [viewing the Borgia Pearl] Can't be real!
Sherlock Holmes: Real as death, old fellow, with the blood of twenty men upon it down through the centuries!