It goes something like this:
The driver parked the car on the street to take a rest. As he lay down on the seat and closed his eyes, a man approached and knocked on the window to ask for the time. The driver opened his eyes and looked at his watch. "It's eight o'clock in the morning," he said. Then he went to sleep again.
But he soon woke up again because the second person knocked on the car window. "Sir, do you know the time?" he asked. The driver looked at his watch again and told the man it was 8:30 am.
At this rate, he would not be able to rest well, so he wrote a note and stuck it on the car window. It read, "I don't know the time."
At one point the man lay down on the seat to take his nap. A few minutes later, a third man came over, started knocking on the car window and said, "Hi, sir. It's 9 o'clock."
6 D