File under stuff we didn't know we needed: a Harry Potter/Brooklyn Nine-Nine crossover blog. We are so thankful for the clever person that has been running the Hogwarts Nine Nine tumblr . The combination of Harry Potter scenes and Nine-Nine is deliciously clever - and something we wish we had thought of first. We've been feeling glum since the Brooklyn Nine-Nine series finale aired back in September of 2021 - the banter between the characters is pretty damn unparalleled. But it's comforting kno…