This cap is from 5x04 "The End".
Click to see the full-sized version.
This moment is so sad....when current!Dean finds out that Sam didn't die in the future, but said yes to Lucifer instead and now his future self is going to kill him.
I'm really uber tired and sleepy right now. This week....it just keeps building and building with what all is going on. I can't think right now, I'm nearly asleep. Off to bed very soon. 'Night all.