8. On the evening of the March 31, 1992, the six family members of the Gruber family were killed with a mattock in Hinterkaifeck, a small farmstead located between the towns of Inglostadt and Schrobenhausen in Bavaria, Germany. Even creepier part is that the murder remains unsolved to this day! Andreas Gruber, his wife, their widowed daughter, her two children and their maid were all killed that evening. The youngest child was rumored to be the son of Andreas and his daughter, who allegedly had an incestuous relationship