My sister has incredibly huge breasts, and all the guys she passes by are glued to them. Even as her brother, I'm always staring at my sister's huge breasts and am constantly rock hard. One day, during a physics class, I misread universal gravitation as 'ban-nyuu chin-ryoku'... That's right, I'm not an Earthling but a boob star person, so 'ban-nyuu chin-ryoku' is fine!
