Mr. Grey: Hey! This train's late! I've been waiting here for ages. Porter: Which train, sir? Mr. Grey: The 8.18 to Baker Street. Porter: The 8.18? I'm afraid you've made a mistake, sir. Mr. Grey: A mistake? My timetable says: Baker Street train 8.18. Porter: Oh no, sir. The Baker Street train leaves at 8.08. Mr. Grey: At 8.08? Porter: You see, sir, they changed the timetable at the end of April. It's the first of May today. Mr. Grey: Changed it? May I see the new timetable? What does it say? Porter: It says: Baker Street train - 8.08. Mr. Grey: Hm! So the train isn't late. I'm late.