9x21 - King of the DamnedI find it so sad that Sammy had such a knowledge of what it feels like to be possessed.
You know what? Can we talk about this?
Sam Winchester has the ability to sit there and analyze the sensation of possession, to describe the differences between being possessed by this entity versus that entity even within the same species. He can sit here and calmly discuss what it’s like to have another being ride along in his head against his will, always with the possibility of just shutting him down and taking over and tell you what was different about this entity versus the other entity riding around in his head at the same time or the one riding him five years ago or the one riding him eight years ago.
And he can do this knowing that the person who made it possible would do it again, and there is nothing he can do to prevent it and there is nothing anyone else would do to prevent it.
He can stay calm and analytical and provide useful information while still conveying that he is upset by the discussion.