Back at the hospital, Dean tries to reason with Carl, but Carl's having none of it. He gets all up in Dean's face and takes a good, long sniff. Judging by Dean's comical expression of surprise, this was not what he was expecting from the specter. "Ohhh, the specter liiikes yooou," Carl coos at him. "Why don't you tell him to come out here and we'll make promise bracelets," Dean says. Carl throws Dean across a nearby desk. The specter likes Dean, but he doesn't like promise bracelets.
Library. Poor soldiers were given a penny on a string by their families. They were for good luck or for buying things, because a penny went a lot farther back then. A light bulb comes on over Sam's head.
But now we're back to the hospital, so his revelation will have to wait. Carl grabs Dean's hand and presses a penny -- the penny -- into it. "Here, have a taste!" Dean's face goes, "Buh?"
Sam calls Dean, but gets his voicemail. He explains all about the penny and the string he found in the tomb. He calls Dean again, but still no answer. When he returns to the motel room, he finds big bro sitting calmly on the bed. Green goo oozes out of his ear. By way of greeting, he points his gun at Sam and says, "You should have looked for me when I was in Purgatory."
Now we get a musical montage of the penny's journey over the last three days. I like Soundgarden as much as the next person, but I'm not sure how necessary this scene really is, especially with the alternating slo-mo and annoying zoom shots. Anyway, the drunken teens take the antique penny, then end up accidentally spending it at the convenience store, where it's then passed on to Mary Lew as change. Then, when her son Scott went rifling through her purse for change, he wound up with the penny. It then passed on to Deputy Doug when he retrieved Scott's inhaler from the evidence locker, then on to Carl who noticed it lying on the floor when he was cuffing Doug. Finally, Carl gives the penny to Dean, which they show again even though we just saw it.
Sam tries to reason with Dean, but Dean's all hopped up on specter rage. "You never even wanted this life," Dean says. "Always blamed me for pulling you back into it." Sam insists that's not true, but his attitude would seem to suggest otherwise. Dean doesn't believe Sam because, as he says, everything Sam's done has been to deceive him. Sam admits he's made mistakes, but this only makes Dean angrier. He rattles off a list of Sam's past transgressions: "Drinking demon blood? Check. Being in cahoots with Ruby? Not telling me that you lost your soul, or how about running around with Samuel for a whole year, letting me think you were dead while you were doing all kinds of crazy? Those aren't mistakes, Sam, those are choices!" Sam, even while staring down the barrel of a possessed person's gun, wants to share the blame. "We've both played a little fast and loose," he says. "I may have lied, but I never once betrayed you," Dean says. "I never once left you to die! And for what -- a girl? You left me to die for a girl!" Sam tries to look contrite, I think, but his underlying pissiness keeps coming through. Finally, he slaps Dean's shooting hand to the side and punches big bro right in the face. They struggle for the gun. Sam shoves Dean against a glass partition, so Dean returns the favor by head-butting Sam and then kicking him into a coffee table.