"smiling like a nice old lady and then stabbing someone in the neck with a knitting needle"
I think she stabbed him in the chest.

You're thinking of 28 Days Later. There is no claim in this movie that the "crazies" had symptoms which were limited to hurting people, like the zombies in the Dead movies are all supposed to be flesh eateers. The trixie virus either did two things to you: kill you or make you crazy. And when you're crazy, you can do one of a million different things, including hurting people but there is no rule that you have to only act this way (like in 28 Days Later). Here, you just become a nut and do incredibly nutty and bizarre things, like: sweeping the grass, raping your daughter, setting yourself on fire and smiling as the flames scorch your flesh, smiling like a nice old lady and then stabbing someone in the neck with a knitting needle, etc.

no, that was hot.
http://us.imdb.com/board/22339870/

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I loved the girl sweeping the grass in the middle of a gun fight, though. She was the best.