Her storyline may have dragged on, but it was still a shock to see Sophia stumble out of the barn as a walker. It was a powerful way to end the midseaon finale of The Walking Dead Season 2, especially with Rick finishing her off for good.
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She was crazy to begin with, but the fact that Carol killed Lizzie revealed just how dark the world has become. And it was a bold move by the show itself to not back out from such a controversial death.
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Hershel's beheading initiated the final prison battle against the Governor. It was a graphic death enhanced by the shots of his screaming daughters.
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This death was shocking made for the fact that viewers saw the reveal the same time as Daryl. Merle ended up a walker, but he still managed to do one last good deed in taking down some of the Governor's men. You even secretly wished he lived.
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Lori's death was a true surprise not only because she went into labor after a walker attack, but Carl then was forced to kill her. The fact that it took place so early in The Walking Dead Season 3 made it even more surprising and revealed that truly no one was safe on the show.
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Carol has a gun in this scene from The Walking Dead. And we all know what she ends up doing with it.
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Glenn has seen better days. This is a photo of the character from The Walking Dead Season 4.
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Abraham Ford has become a key character on Season 4 of The Walking Dead. This is a photo from Episode 15.
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The Walking Dead Quotes

Daryl: You've got some balls for a Chinaman.
Glenn: I'm Korean.
Daryl: Whatever.

You walk outside, you risk your life. You take a drink of water, you risk your life. Nowadays you breath and you risk your life. You don’t have a choice. The only thing you can choose is what you’re risking it for.

Hershel