One young man in his youth was interested in the peculiarity of the shape of the spiral of the stream during urination. With the same hooligan friend, built a model. And thoroughly investigated the dynamics of the process, on the basis of this built a mathematical model.
This hooligan was Nobel laureate Niels Bohr. His graduate project, dedicated to determining the surface tension of water by the vibrations of a water stream, was awarded a gold medal by the Royal Danish Academy of Sciences.