My maternal grandfather was a very strict god fearing puritan Sikh. When I was a college student, he told me that if a person shows disrespect to the Holy book of the Sikhs, Guru Granth Sahib or otherwise abuses God, then he is bound to become a leper.
Then he told me the story of an Arya Samaji gentleman who saw Sikhs worshipping the holy Guru Granth Sahib and remarked that they were indulging in idol worshipping by paying obeisance to the holy book and wasting their time. Soon, according to my maternal grandfather, the Arya Samaji gentleman developed leprosy and became a leper. This was not the first time that I was to hear such a story.
When I got married into a Hindu family, my wife's uncle told me that he used to wash the Shivalinga with milk every day. One day, a Sikh came to that place and told him that nothing is going to come out of this ritual and it was superstitious on his part to wash the Shivalinga in this way. Soon, the Sikh according to my wife's uncle became a leper. Then there was my atheist uncle who did not believe in God but had faith in one of our forefathers, Baba Baji Sahib who was supposed to be a holy man.
One day, he told his daughter in my presence that she should stop lying otherwise he would have to pray to the Baba that she might not become a leper. It was at that time that I began to wonder whether one becomes a leper this way because my scientific study told me that one becomes a leper by developing leprosy though infection with very weak bacteria which takes many years to develop and yet all these well educated people believed in such funny things.