John: You drugged me?!
Sherlock: You were yawning, so I put uppers in your coffee. If you’re still yawning after that, then the yawning is a symptom…
John: You don’t know my medical history! You could have killed me! [yawns]
Sherlock: Aha! You yawned!
John: AHA! YOU TRIED TO KILL ME!










