I think Jack was sensational. I met Jack during the filming of the pilot many years ago now, and he’s like the nicest guy you’d ever want to meet. […] He created someone that everybody hates, and loves to hate, and that’s a considerable feat of acting. I feel a little guilty that he’s quitting acting now. I hope that playing Joffrey didn’t help make him want to retire from the profession because he does have quite a gift for it and could have a major career as an actor.
― George R. R. Martin talking about how Jack played Joffrey (x)