1. When he revealed how Sherlock survived the Reichenbach Falls.
2. Except not really.
3. When he taught Jeremy Clarkson how to throw a punch.
4. When he revealed he knows about the fanfic.
5. And is aware of how fanfic writers get their ideas.
6. When he made these faces.
7. Oh, and this face.
8. When he said this.
9. Which then led to this.
10. And, of course, this photoshoot.
Watch the full episode on iPlayer now.