John Watson, Sherlock Holmes and others in “Unfinished Business”

John Watson

I saw the ghost with my own eyes!

Sherlock Holmes

You saw nothing. You saw what you were supposed to see.

John Watson

You said yourself: I have no imagination.

Sherlock Holmes

Then use your brain, such as it is, to eliminate the impossible, which in this case is the ghost, and observe what remains, which in this case is a solution so blindingly obvious even Lestrade could work it out!

[sarcastic] Thank you...!