Spock: Doctor, if I were able to show emotion, your new infatuation with that term would begin to annoy me. 

McCoy: What term? Logic? Medical men are trained in logic, Mister Spock. 

Spock: Really, Doctor, I had no idea they were trained. Watching you, I assumed it was trial and error. 

Star Trek — Season 2: Episode 14 — “Bread and Circuses”