One morning he was reading his newspaper on the train when a man sitting behind him, who Mr. Smith had never met before,

leaned forward, tapped him on the shoulder and spoke to him. The man said, "You're not leading a very interesting life, are

you? You get on the same train at the same station at the same time every morning, and you always sit in the same seat and

read the same newspaper."

Mr. Smith put his paper down, turned around, and said to the man angrily, "How do you know all that about me?"

"Because I'm always sitting in this seat behing you," the man answered.