From time to time I hear about people coming up with creative/"non-mainstream" solutions to classical physics problems, whether by looking from a very different angle or using some unusual math that's unknown to anyone but that one slightly quirky professor from faculty of mathematics. However I have sadly yet to see one myself. So, here is my question to professors, teachers, tutors and students of pf, do you have any such stories? Please share! Edit: I was noted that my wording was ambiguous. By "non-mainstream" I mean a creative yet legitimate way that one is unlikely to find in most textbooks because it is less obvious or too much out-of-the-box. It was not my intention to discuss pseudoscience.