John: Don’t do that.

_{Sherlock: Do what?
John: The look.
Sherlock: Look?
John: You’re doing the look again.
Sherlock: Well, I can’t see it, can I?}

…
_{Sherlock: It’s my face.
John: Yes, and it’s doing a thing. You’re doing a ‘we both know what’s really going on here’ face.
Sherlock: Well, we do.
John: No. I don’t, which is why I find the face so annoying.}