This document lists 8 seemingly useless inventions from Japan, including a stand that holds a single piece of paper, rain that falls only on a person's head, eyedrops for people who don't need them, a device that lets fathers experience the feeling of nursing, a way to slurp up all of one's noodles in one bite, a machine that transports people very short distances, butter that never melts, and a type of cold that only affects one person.