In Sherlock: The hound of Baskervilles, Sherlock describes his feelings about not being able to distance himself from his latest felt feeling, fear and he says
The grit on the lens, fly in the ointment
To which, Dr Watson replies
Yeah, all right, Spock, just.. take it easy
The only Spock I have ever known is this man:
Why is he being referenced here? Is Watson talking about this Spock?