There aren't many times where we were actively cheering on the undead, but in the case of the windshield walker, we definitely were. We were already sick of Lori by season two, so when she inexplicably rolled her car to avoid hitting a walker, not many were overly fussed at the prospect of her becoming zombie chow. The walker who impressed the most was this guy, who was so determined to get a meal he forced his face through the windshield glass, leaving most of his skin behind. Fantastically gory.
8. Penny
The first of the two children who drove the Governor insane was his own daughter, Penny, who he thought it would be perfectly safe to keep locked in a cupboard, only letting her out to brush her hair. Penny's very presence was exceptionally creepy in itself, but was compounded when Michonne discovered her, even hugging the undead girl before removing her hood and recoiling in horror with the rest of us to see what was underneath.