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Season 2, Episode 17 (2006)
Seriously, Meredith, I understand curiosity and everything, but maybe don't go out to watch the active explosive be taken away?
When Derek Died
Season 11, Episode 21 (2015)
Did anyone really think they'd kill off McDreamy? Send him on a long fellowship to get Patrick Dempsey off the set? Sure. But hadn't Meredith been through enough?
When Addison Shows Up
Season 1, Episode 9 (2005)
Maybe it's just shocking that Seattle Grace's star-crossed lovers have nine relatively happy episodes together before shit starts hitting the fan.
When Cristina Collapses In The OR
Season 2, Episode 3 (2005)
Really, what except for a medical emergency could make Dr. Yang miss an answer? A later shock is when Meredith isn't allowed in the OR to hold her hand.
When Izzie Reveals She Has A Daughter
Season 2, Episode 15 (2006)
Grey's knows how to handle the big backstory reveals, but this one came from a bit of a misdirect — it seemed safe to assume the biggest secret from Izzie's past had already been exposed: her time as an underwear model.