Yesterday Ann woke up at seven thirty. She had a quick shower, a cup of coffee, got into her car and drove to work. She found a parking space right outside the office door. “That’s very strange,“ she thought as she walked up to the front door of the office building. Usually there were a lot of cars outside her office and she left her car in another street. The door was locked when she tried to open it. This was very unusual. She looked at her watch - it was exactly nine o’clock! “The door is never locked at nine o’clock,” she said to herself. She took out her key and unlocked the door. Ann went to her office and sat down behind her desk. What was the matter? Where was everyone? Then she saw her diary on the desk. “Oh no!” she said. “Today is Saturday!”