Nannie Doss (November 4, 1905 – June 2, 1965) (also known as the Giggling Granny) was a serial-killer who managed to poison her entire family with cyanide before gleefully admitting to all her crimes to police, laughing and earning her nickname.

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By the time she was finally caught, she'd killed her mother, two sisters, two daughters, a nephew, a grandson, and four husbands -


most horrific of all was that she had no known motive other than she found it amusing.

 Not true, she had a sort of twisted reason, to get back at life for living an unhappy childhood.  That isn't to say that she didn't find it amusing, she did.