Top 5 Saddest Movie Scenes

As you sure understand, this list contains spoilers. These are the movies included in the list:
The Straight Story, Dancer in the Dark, The Thin Red Line, Hachi: A Dog's Tale, Requiem for a Dream

I suggest you watch the full movies first, because all these scenes are better when built up.

#5. The Hanging

from Dancer in the Dark

#4. The Letter to Jack
from The Thin Red Line

#3. The Reunion 
from The Straight Story

#2. Hachi Waiting
from Hachi: A Dog's Tale

#1. Sara Goldfarb
from Requiem for a Dream

I could include many scenes with Sara Goldfarb, but this may be the saddest.