What is your favourite American/British drama?

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Have you ever been addicted to one drama and paid all your attention to it day and night. For me, once I was obsessed with the American drama FRIENDS. I liked it so much that I watched it continually for several days in 2005. And even I stored it in my MP4 for enjoying it over and over again. I was crazy about it at that time. But it was a very warm and good time to recall. Of course now it is convenient to watch the dramas by phone and computer. So What is your favourite American/British drama and what is the most impressive story line? Would you like to share?