A sneak preview of "I Will Follow You Into the Dark" from the fifth season of Grey's Anatomy.
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Another scene from "An Honest Mistake," in which Izzie finds out that someone else may have a terrible illness, not the woman she misdiagnosed.
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A scene from "An Honest Mistake," in which Mark and Derek come to blows in front of everyone at Seattle Grace.
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Here's Ellen Pompeo on The Late Show with David Letterman, February 16, 2009.
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A final preview of "An Honest Mistake," which originally aired February 19, 2009 in the fifth season of Grey's Anatomy.
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A clip from "An Honest Mistake," the Grey's Anatomy episode that wraps up the crossover event.
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Another sneak preview of "An Honest Mistake," from the fifth season of Grey's Anatomy.
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A sneak preview of "An Honest Mistake."
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Grey's Anatomy Quotes

Did you say it? 'I love you. I don't ever want to live without you. You changed my life.' Did you say it? Make a plan. Set a goal. Work toward it, but every now and then, look around; Drink it in 'cause this is it. It might all be gone tomorrow."

Meredith (closing voiceover)

I want to marry you. I want to have kids with you. I want to build us a house. I want to settle down and grow old with you. I want to die when I'm 110 years old, in your arms. I don't want 48 uninterrupted hours. I want a lifetime. Mmm. Do you see what happens? I say things like that and you fight the urge to run in the opposite direction. It's okay, I understand. I didn't, but now I do, I do. You're just getting started and I've been doing this for a long time now. Deep down, you're still an intern, and you're not ready.

Derek