Mr. Robinson worked in an office. Every morning he had breakfast with his wife at half-past seven, read his newspaper, drank a cup of coffee and then left his house at 8 o'clock to go to catch his train to town.
One morning he was still sitting comfortably at the breakfast table and reading his newspaper at five minutes past eight. He did not seem to be in a hurry and asked his wife for another cup of coffee.
"Another cup?" she asked. "But aren't you going to the office today? have you got a holiday?"
"The office?" he said and looked up from his newspaper very surprised. "I thought that I was at the office!"