Mr. Vague: "Every so often."
Dr. Grumpy: "Well, how much time goes by between headaches?"
Mr. Vague: "A while."
Dr. Grumpy: "I'm trying to get an idea of how often you get migraines. Can you be more specific? Do you get them every day, or every week, or once a month?"
Mr. Vague: "Sometimes."