Alex stands in front of the four totally non-sex-having, non-pregnant-getting, teenage girls. They gape. He walks closer to them, all confidential. "So, you wanna see him? Your baby?" Girl Two: "It's not our baby." They're good. Teenage girl good.

Inside a conference room, the parents want to know what the hold-up is with determining the mother. Addison has to explain to them, like they're five years old, that she can't do anything to the girls if they don't want her to. A mother argues that they're minors; as parents, they should still have a say. Webber tells them they certainly don't -- if someone doesn't want to submit to a vaginal exam, they don't have to, because it's the law. Just how stupid are these parents? Don't they watch medical dramas? The angriest daddy says he's taking his daughter home right now. Webber blocks his exit and says he'll have him arrested as soon as he hits the parking lot. Addie tries to make them understand that it's not just the law at stake here -- with a vaginal exam, the girls could be experience bleeding and/or vaginal trauma and/or emotional stress. This causes the parents to start fighting with each other about whose little girl is the worst: this one doesn't have a curfew, that one steals lipsticks, and so forth. We get a close-up on Addie as she starts to tune them out, and the ticking starts. Flashback!

It was a dark and stormy night. No, seriously. It's raining outside Addison and Derek's house as he pulls a bunch of clothes out of the closet, and she beseeches him to listen to her. "Derek. Derek, you can't do this. We have to talk about this, you have to give me a chance." She's got on an old CBGB t-shirt, no makeup, her hair's down -- she looks beautiful, and she is positively frantic. He ignores her and starts down the stairs with the clothes. Addie follows him. "You have to give me a chance to explain. What are you doing? What are you doing with my clothes? Derek, it was one time, I know that's what people say, I know that's what always gets said, I don't even know how it happened, he was just here!" She can't stop talking. It's pathetic and awful, and now McDreamy is at their front door. "You screw my best friend and all you can say is that he was just HERE?" He opens the door and flings her clothes out into the rain. "Get out." Addie says no. He tells her again to get out. Addie wants to stay and talk about it. Derek: "Get out. Of my house." He grabs her off the stairs and literally puts her out, then slams the door in her face. We get a shot of Addison standing outside her house, with no pants, in the rain, crying, and it's the saddest thing I've ever seen. "Derek, please," she begs. "Please, please, please." She's bawling, and her voice is hitching like when you're a little kid. Oh, Addison. Derek can't stand it anymore, and opens the door for her. She falls into his arms and says she's sorry, so sorry, and he has to give her a chance to show him how sorry she is. Oh my God. She tries to touch him on the face, but he won't let her. He says he'll stay elsewhere and get his clothes in the morning. Addison begs him not to go. "We can survive this. We're Addison and Derek." He says he can't look at her without feeling nauseous, and they're not Derek and Addison anymore. Addison tells him that if he goes now, they are not going to get through this. "If you go now, we don't have a chance. If you go now." As she says this, he opens the door and walks out. Tick tick tick. Back in the present, the whole world is crying. Commercials.