I watched the finale of 6 feet under. It was amazing.

I'll give a brief explanation.
6 feet under is a show about death. It's centered around a family, the Fischers, that own a funeral home. Every episode begins by showing someone who dies, then get brought to the funeral home. The first episode, it is the father of the Fischers, Nate Fischer Sr. He has two sons, Nate Jr., and David (gay). He also has a daughter, Claire, and a wife, Ruth. And the funeral home's other partner, Federico.
A few episodes from the end, Nate Jr. dies too, from an AVM.
In the finale of the final season, it ends with Claire driving away, and it shows the future deaths of everyone in the show. How depressing.

It first shows how everything is going smoothly.
Ruth runs a dog day care.
David marries his boyfriend, Keith.
Everyone has moved on from the death of both Nate's.

Then, 20 years after the show ends, it shows a sad scene. Ruth is lying on a bed, dying. Her new husband, George Sibley, has stayed with her, and is standing next to her, with David and Claire and Keith.
Ruth looks over, and sees a vision of Nate Jr. and Sr. standing next to each other in the doorway. Then she closes her eyes, and dies, at the age of 79.
Tears squeeze out of George's closed eyelids.

4 years later, you see a much aged Keith starting to unload an armored car. He appears very stiff and old. Then, he gets shot twice. He falls down, and masked men begin stealing all of the stuff within the armored car. He dies, at the age of 62.

16 years after that, you see another pleasant scene. Claire is getting married. She finally marries the love of her life, Tim.
Brenda, Nate Jr.'s wife, watches, with a new man beside her.
David sits in the front row, appearing quiet and serene.
After that, they're having a picnic. Claire is in Tim's arms on a chair.
David looks over at the kids playing football.
Suddenly, he sees a vision of Keith catching the ball, and looking over at him.
David keels over, and dies, at the age of 76.

Not long after, you see a calm cruise ship at sunset. Federico is talking to his wife Vanessa, on some chairs.
He gets up, and starts walking, when he falls down, his hat tumbling off his head.
Federico dies, at the age of 75.

A few years later, you see, in a nursing home, Nate's old wife, Brenda, is talking to her brother, Billy.
He appears quite agitated, talking quickly.
Then, Brenda's head lols over, and she dies, at the age of 82.

Finally, much later, you see a room. There are pictures covering all walls. You recognize David and Keith, Ruth and George, Nate and Brenda, all healthy and young.
There, lying on a bed, incredibly aged, is Claire.
Cataracted eyes spinning in their sockets, alone in that room, the last thing she sees is pictures of everyone she used to love, but now she had long outlived, and she had no one left.
Claire dies, at the age of 102.

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The message this show sends is about death. Everyone dies, and we move on.
It's depressing, sometimes.

Claire outlives everybody.

We all probably want to live for a while, but does anyone want to end up like Claire?
Alone, decrepit, seeing how long you can stave off your inevitably near death, sitting in a room, looking at pictures you can barely see, of all your family, and friends, and everyone that you used to love and care about, but who is now long dead in years past?