Mr. Jones used to travel by train and put his bag on the seat beside him to have comfort. He said it was another passenger's bag. An old man arrived, looked at the bag, and said," Is this somebody's seat?", Mr. Jones answered," Yes. A friend of mine has gone to buy some sandwiches. He will return soon." The old man said," I'll sit here until your friend comes back. The train began to move and Mr. Jones' friend didn't come back. The old man jumped up and said, I'm sorry, your friend seems that he has missed the train. We don't want him to lose his bag. "He threw it out of the window. Mr. Jones couldn't say a word because he was a liar. He decided not to play this trick again.