Star Trek: The Next Generation. It was the episode named "Yesterday's Enterprise" where Captain Jean-Luc Picard and the USS Enterprise crew were in an alternate timeline where the Federation is at war with the Klingons. By far the best Star Trek TNG episode, in my opinion.
I'm watching "Soprano's" at the moment. It's about an Italian mob boss around the year 2000. It's really interesting and the story's good. IMDB gave it a high ranking and I agree.
@Jet
Yes I have watched Parks & Rec. too. It's from the same producer as The Office. I love both shows. The humor is so cheesy yet funny. What's your favorite character? Mine's Ron.