Returning home can be a culture shock in itself.
Students return home and realize how much their hometown has changed.
Going off to a University in most cases, is your first time away from home, so when you return to a new home or town you experience culture shock. In addition, many of your friends have moved away and you have lost contact with them. These are all big changes, however, you are dealing with it the second time, so it will be smoother moving from one sphere to the next.