When thus alone, I not unfrequently heard Grace Poole’s laugh: the same peal, the same low, slow ha! ha! which, when first heard, had thrilled me: I heard, too, her eccentric murmurs; stranger than her laugh. There were days when she was quite silent; but there were others when I could not account for the sound she made.
– Charlotte Bronte
Jane Eyre, Chapter 12. When Jane is pacing through the Gothic mansion of Thornfield, she hears frequently the eeric laugh that she believes to be that of the eccentric Grace Poole. What Jane doesn’t realize yet is that the laughter and strange sounds she often hears are from the madwoman in the attic Bertha Mason.