Sherlock Holmes: What is that? (balloon with a face drawn on it)

John Watson: That is… me. Well, it’s a me substitute.

Sherlock Holmes: Don’t be so hard on yourself. You know I value your little contributions.

John Watson: Yeah? It’s been there since nine this morning.

Sherlock Holmes: Has it? Where were you?

John Watson: Helping Mrs H with her Sudoku.

From Sherlock – Season 4 Episode 1: ‘The Six Thatchers’ (4×01)