Sherlock and Joan in “Unfinished Business”

Sherlock

Quite frankly, I'm surprised it's taken this long for the captain's marriage to buckle. He's an excellent detective.

Joan

What does that have to do with it?

Sherlock

Well, as you know, detection is a calling, not a job. Hardly leaves one with time left over to sustain the elaborate ruse of marriage.

Joan

Because, of course, you think marriage is an elaborate ruse.

Sherlock

There are other ways to describe it. An unnatural arrangement which forces its participants into an unhealthy monogamy. An accretion of petty fights and resentful compromises which, like Chinese water torture, slowly transforms both parties into howling, neurotic versions of their former selves.