Abstract: Funny objects are flying across the universe. Some planets recall apples, some asteroids are banana-shaped, and Saturnian rings look like crepe. If you (or a space mission) want to get close to, move around, and/or land on them, you need to estimate, measure, and/or analyze their gravitational fields. Nevertheless, the routine recipe named the spherical harmonic expansion does not always work due to the curse of Brillouin, who is famous for Brillouin scattering and stands for B of the WKB approximation. This talk rephrases the author's hard days to tackle this fundamental problem as a sort of fairy tale. If you prefer a serious story and/or detailed information including the PDF of academic articles and related Fortran programs, please visit the following WEB site of the author's: https://www.researchgate.net/profile/Toshio_Fukushima