The thing is, no matter what Dirk might be feeling, it almost never shows on his face. It's not that he's doing it on purpose, not entirely. He'd practised extensively in front of a mirror just to perfect a few choice expressions. But in the end, he actually prefers his stoicism (conscious and unconscious both) to anything less under his control.

It's no small thing to say that the deadpan of his voice is even less deliberate, but he's gotten comfortable with that part of himself too.

"John. Don't be a bitch."