[Watson] “Do you mean to say that you read my train of thoughts from my features?”
[Holmes] “Your features and especially your eyes. Perhaps you cannot yourself recall how your reverie commenced?”
"No, I cannot."
"Then I will tell you. After throwing down your paper, which was the action which drew my attention to you, you sat for half a minute with a vacant expression. Then your eyes fixed themselves upon your newly framed picture of General Gordon, and I saw by the alteration in your face that a train of thought had been started. But it did not lead very far. Your eyes flashed across to the unframed portrait of Henry Ward Beecher which stands upon the top of your books. Then you glanced up at the wall, and of course your meaning was obvious. You were thinking that if the portrait were framed it would just cover that bare space and correspond with Gordon’s picture there."
"You have followed me wonderfully!" I exclaimed.
"So far I could hardly have gone astray. But now your thoughts went back to Beecher, and you looked hard across as if you were studying the character in his features. Then your eyes ceased to pucker, but you continued to look across, and your face was thoughtful. You were recalling the incidents of Beecher’s career. I was well aware that you could not do this without thinking of the mission which he undertook on behalf of the North at the time of the Civil War, for I remember your expressing your passionate indignation at the way in which he was received by the more turbulent of our people. You felt so strongly about it that I knew you could not think of Beecher without thinking of that also. When a moment later I saw your eyes wander away from the picture, I suspected that your mind had now turned to the Civil War, and when I observed that your lips set, your eyes sparkled, and your hands clenched I was positive that you were indeed thinking of the gallantry which was shown by both sides in that desperate struggle. But then, again, your face grew sadder, you shook your head. You were dwelling upon the sadness and horror and useless waste of life. Your hand stole towards your own old wound and a smile quivered on your lips, which showed me that the ridiculous side of this method of settling international questions had forced itself upon your mind. At this point I agreed with you that it was preposterous and was glad to find that all my deductions had been correct."
"Absolutely!" said I. "And now that you have explained it, I confess that I am as amazed as before."
"It was very superficial, my dear Watson, I assure you. I should not have intruded it upon your attention had you not shown some incredulity the other day. But I have in my hands here a little problem which may prove to be more difficult of solution than my small essay in thought reading."
And *especially* your eyes.
tl;dr: Holmes you have been staring at Watson for a disturbing length of time what the heck are you doing oh my God dude you are seriously freaking ridiculous
(from The Adventure of the Cardboard Box, aka The Adventure of Holmes Talking Watson’s Absurdly Expressive Face Off About Random Crazy Stuff While Nothing Of Interest Actually Happens)
It was late that night when Holmes returned from his solitary excursion. We slept in a double-bedded room, which was the best that the little country inn could do for us. I was already asleep when I was partly awakened by his entrance.
"Well, Holmes," I murmured, "have you found anything out?"
He stood beside me in silence, his candle in his hand. Then the tall, lean figure inclined towards me. “I say, Watson,” he whispered, “would you be afraid to sleep in the same room with a lunatic, a man with softening of the brain, an idiot whose mind has lost its grip?”
"Not in the least," I answered in astonishment.
"Ah, that’s lucky," he said, and not another word would he utter that night.
”—This, right after Holmes had remarked to someone: “Darkness and Dr. Watson’s umbrella—my wants are simple.”