themegalosaurus:In 7x02 we see Sam dig into a fresh cut on his left hand in order to ground himself
themegalosaurus:In 7x02 we see Sam dig into a fresh cut on his left hand in order to ground himself in the face of his Hell hallucinations. Since then (and long after the wound has healed) Sam’s used the same technique in other moments when he feels uncertain about reality. (Edit: updated with S12!) -- source link