Saddest Endings You have seen.

[Owithrow]

The saddest ones for me-
Angel Beats
Ga-Rei Zero
Final Fantasy 10
Specificly the episode in futurama where fry finds his fossilized dog

[Outcast]

Gundam 0080 is the only thing I've watched with a particularly sad ending.

SPOILER! :

Bernieee! T_T

[Owithrow]

People say elfen lied is pretty sad at the end, but i havent finished that one.

[Outcast]

I didn't find it all that sad at the ending.

[Rubisko]

Bladerunner. For empathic reasons I guess

[GunZet]

Samurai Champloo. Cause it ended.

[Gaff]

Grave of the Fireflies is a pretty bad one. It's not even a spoiler to say the kids die at the end - the film tells you that right at the beginning.

[Shnorkel]

I didn't find it all that sad at the ending.

Mabye the ending itself wasn't sad,

SPOILER! :

but Mariko's death was the freaking saddest thing that I have ever seen

Also Code Geass and Angel Beats.

[Matt]

Elfen Lied's saddest moment wasn't the ending, at least for me (personally, I found the ending to the manga more hopeful than sad). It was:

SPOILER! :

Kouta's sister is cut in half and killed right after he insults her. He is never able to apologize, and therefore has to live with the guilt forever, and she dies thinking he hates her.

[eltoroguaco]

I agree with the dog on futurama. that ending almost made me weep.
Another sad/touching futurama ending is the one about Fry's Brother.

Then we have the ending on Harry Potter and the Half-Blood Prince. I don't mind the part where Dumbledore actually dies. But the scene after is extremely touching.
Another Harry Potter ending is Deathly Hallows part 1 when Dobby dies But on the books, the whole deathly hallows is way more sad than any other of the books. They didn't get it sad enough in the movies.

Got another sad movie ending; The Green Mile. Enough said.