Mrs Smith's husband went off on a business trip to Australia. He wanted to catch the 3:30 plane to Darwin. She was very surprised when he telephoned her at 5 o'clock and said that he was still at the airport. "What happened?" asked Mrs Smith. "Well," said Mr Smith, "everything was going fine. I got my ticket, checked my luggage and waited in line at the gate. I walked across the runway to the airplane and I saw my friend Jack Scott. Jack was an airplane engineer. I shouted to him and a policeman caught me." "Why did he catch you?" "I don't know," said Mr Smith," All I said was 'Hi, Jack! '" The word "hijack" means "to take control of a plane by force". Why was Mr Smith caught by the policeman?
Because he didn't keep silence at the airport. Because he greeted an airport engineer named Jack. Because the pronunciation of "Hi, Jack" has another frightful meaning. Because the policeman didn't know English.