If You Float You’re a Witch
The witch hunts were essentially designed to root out anyone that opposed or didn’t conform to the patriarchal model of the time (and this one). Specifically, this meant single women, widows, the old, and the poor. All of these people were considered a needless expense of their village, because they did not neatly fit into the “woman’s” role as wife, child-bearer, or even sex object. If they couldn’t be used for baby-making, they were of no use to society.