Did anyone else notice that Sherlock said, "If I was to shoot you" near the end of the episode, after making all that fuss about the correct use of was and were at the beginning?
However, I am neither a geek nor a Dr Who fan. Thankfully, I now don't need to write up how I thought Moriarty was going to be Tennant. Sherlock would have torn my theory into shreds in a jiffy and would be quick to tell me what an idiot I am. 

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