Ever since Elena became a vampire, she's starting walking down the mountain of sanity into the world of crazy. Now that she's killed a human, it looks like she's about to reach the bottom.
http://blogs.wsj.com/speakeasy/2012/11/15/the-vampire-diaries-season-4-episode-6-we-all-go-a-little-mad-sometimes-tv-recap/?mod=WSJBlog
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