It started, as most things did in Kakashi's life, with a mission gone wrong. (In which Kakashi accidentally acquires an emotionally healthy coping technique.)
Apparently even Gellert Grindelwald isn't immune to a niffler's sticky paws. (In which Newt was not expecting to find Percival Graves in a stolen cigarette case.) [Posted here until FBAWTFT gains a separate category.]