I stumbled across a really good - and a really long! - Merlin fic - which I'm still reading, BTW - and that made me want to see the show again. So, I dug out S1 that I had somewhere on DVDs. My favorite Merlin/Arthur scene? The one in 113, when Merlin's about to go and pay with his life for Arthur's and he goes to say good-bye to him. It's amazing. When Merlin tells Arthur "Don't be a prat" and then just leaves... Man, the actors played that really well!