 Addison reveals why she s in the dumps, which explains why Mark is dumping all over her. George is in the dumps about his father s surgery, Derek about Meredith s snoring, and Izzie about the fact that Bailey still won t let her scrub in on any surgeries, even though Izzie pays for one of them. Meanwhile, the cat and mouse game continues between Preston and Christina as they refuse to let the other show how much they really care about each other.