That final episode is an utter masterpiece of television, and I don't just mean in the comedy genre. From when George says "I'm scared, sir" the whole tone changes.
I first saw it in my Year 9 History class - teacher was a huge Blackadder fan and we watched one episode per week. Having never seen the show before, I assumed that they were going to get out of it and all live happily ever after. The realisation that they weren't was shocking and sobering.
The fade to a field of poppies is just genius. For that episode alone it beats The Office for me, even more easily when the rest of the show is taken into account.
"We lived through it. The Great War, 1914 to 1917" - has a more heartbreaking line ever been written?
Yeah I was going to mention the last episode as well. It was one of the best endings of a show I’ve seen, done so well.