Have you heard about the new, totally hilarious hashtag #BlackHogwarts that has gone viral? The idea is straightforward, but it’ll make you laugh for days on end. Take a look the hashtag that Twitters users, including Harry Potter author J.K. Rowling, are all about these days: Moaning Myrtle haunting the bathrooms like… #BlackHogwarts pic.twitter.com/K31A2Xflip — Reshad Asgarali (@Reshadjason)...