"What the heck? Of course John can read!" <--- this is kidlock, John doesn't have to know how to read because for all we know they could very well be 4 years old. Which makes it ten times cuter if you think about John and Sherlock at four years old
TV - Sherlock: Watson: So where have you been? Sherlock: Became a dragon and space terrorist, you? Watson: I was a Hobbit. Sherlock: What's a Hobbit? Watson: It's a.Wait a minute.Your voice. Sherlock: What?