and, if that last reference made half-sense:

You've been playing -- or should play -- the OC Drinking Game, brought to v.2 by Jessica Lee Jernigan:

When Kaitlin, Marissa's make-believe sister and Julie Cooper's pretend daughter shows up? That's one drink for you. If a new child actress shows up in the role, take three. If the new child actress is conspicuously older or younger than the current child actress: shotgun a six-pack.