Sherlock's face when he realized that Archie just out-Sherlocked the Detective himself. << And the fact that Sherlock takes Archie seriously. Maybe because nobody ever took Sherlock seriously when he was little.
Gatiss: "Some people said he couldn't be dead, because we didn't see the top of his head blow off. I don't think they realize that there are still things you can't show on BBC One." --Well we know Moffat lies. It's rule one!