I remember reading The Tell-Tale Heart in high school, and my friend asking me afterward, as she had also read it, for we were in the same class in which the story had been assigned, whether I thought the narrator was insane, to which I’d responded that I didn’t know, but that my first impression was that, yes, he was insane, despite his claims to the contrary, which caused my friend to laugh, and to make the observation that sanity is one of those things you cannot say you have without casting doubt upon yourself.