The actor for Joffrey, Jack Gleeson, is in my class.. He's actually one of the nicest and most down to earth people you'll ever meet. It's quite hilarious though because at this stage, he has to run between classes and always gets stopped when walking around campus.
ALSO Jack is a genius. At my school you can choose to sit these extra exams and if you get over 70% in all of them you become a scholar. The exams are ridiculously difficult. But Jack sat them while filming GOT.. and became a scholar! The result is he no longer has to pay fees, gets a free meal every day, gets free books, gets free accommodation on campus and gets paid a nominal wage! It lasts for 5 years!
http://www.independent.ie/entertainment/tv-radio/jack-gleeson-swaps-game-of-thrones-for-seat-of-learning-26843778.html