Where you think you're more awesome than everyone else, and that your opinions are so right, they don't require justification and everyone else is stupid for thinking differently.
Person 1: "I disagree with you, I think the Beatles is a boy band because some of their early stuff shows especially the commercialism aspect of boy bands."
Jack: "That's wrong, obviously the Beatles isn't a boy band."
Person 1: "That's actually the Jack Fallacy, not a real argument."
Jack: "Anyone who doesn't believe in God is an idiot, there's obviously a God."
Person 2: "the Jack Fallacy."