Personally, I tend to get into habits with breakfast. For at least two weeks I had an English muffin with honey and butter and a cup of coffee for breakfast. Every. single. day. Habits go beyond breakfast, though- they are a part of many of the choices we make every day.
How can we, as designers, take advantage of the fact that people are creatures of habit? At the very least, it is something to keep in mind when designing consumer products.