Like a lot of people, and being that I'm sitting here on my lunch break so don't really have mind space to play with, I'd have to say one of my favourite scenes has to be Christmas at 221b, if nothing else for Sherlock and Molly. She must be utterly mortified but it takes him a minute to think, then the brain to process, and then to feel. We see more and more of that as Sherlock has more to do with the outside world. I do however also love moments when there is Sherlock and Mycroft, the dynamic between them yes ok reeks of previous battles between them but there is still a hint of brotherly-ness on occasion. The actors and direction makes such a huge difference to that particular dynamic I think. I just love the idea Mycroft is just a civil servant.. much. hehe. There's loads more I could pick out but my brains too full of boring stuff.