After driving for about six hours, a trucker decides to pull over and sleep for a little while. As soon as he falls asleep, he is awoken by some knocks on the door of the cab. 

“Yeah, it’s 4:30,” answers the trucker. He falls asleep again, but he is awoken again by another jogger who wants to know the time. 

“It’s 4:40!” yells the trucker. Deciding to really try to sleep a little, he writes on a piece of paper: I DON’T KNOW THE TIME. He sticks the paper in his windshield. 

But he is awoken again. ‘It’s 5:25!” another jogger yells at him.