Dean realizes Sam's said more than he intended to. "Sam, I never said anything about demon blood. You knew about that?" When Sam admits he's known about it for about a year, Dean is pissed. When Sam doesn't want to go out carousing, Dean is pissed. When Sam douches up the Metallicar, Dean is pissed. Dean is pissed at his brother a lot. I imagine Sam must be numb to it by now, because he misses his chance for a The Best Defense Is A Good Offense sort of response. He should have been up in Dean's face demanding why he didn't tell him -- the person who ingested the demon blood 25 years ago. Instead, he just apologizes and Dean slathers on the guilt about Sam saying he's sorry a lot lately. He gets all bitter with Sam, telling him, "But whatever; if you don't want to tell me, you don't have to. It's just fine." I don't belieeeeeeeeeve him. Sam whatevers him right back, because apparently they're nine years old.
Back at Jack's, it must be the next day, because Jack is starving, and wants to know when dinner is. Michelle says it'll be ready in 45 minutes. Outside, Dean and Sam use binoculars to spy on him from their car. At first they see him grab a beer, and can't figure out what sort of unusual activity they're supposed to see, so they're thinking their stakeout is a bust. Jack goes back into the fridge and grabs some chicken and starts shoving it down his throat. He might even eat the bones; I couldn't watch all that closely. Face still covered in chicken grease, he grabs a pack of raw ground beef from the fridge and starts mowing down on that. It's all over his face, and the drippings are all over his shirt. I'm sure Raoul is getting excited, because while it might not meet his gore standard, it does seem like a promise of things to come, but I'm suddenly thinking of going vegan. When Michelle calls to Jack, he tries to get a hold of himself. Outside, Sam tells Dean he thinks that qualifies as weird. Since he's been making the possessed barf out the essence of their tormenters, he ought to know.