On the few occasions that Halliday agreed to do interviews, his behavior came off as bizarre, even by game-designer standards. He was hyperkinetic, aloof, and so socially inept that the interviewers often came away with the impression he was mentally ill. Halliday tended to speak so rapidly that his words were often unintelligible, and he had a disturbing high-pitched laugh, made even more so because he was usually the only one who knew what he was laughing about . When Halliday got bored during an interview (or conversation), he would usually get up and walk out without saying a word.