On a ship the Captain and the Chief Engineer were having a friendly argument as to who had the most important job. So they agreed to exchange jobs for the next day.

After a few hours the Captain, covered in oil and sweat, called the Chief Engineer over and said, “It’s no good, no matter what I do the engine won’t start.”

The Chief Engineer just looked at him and said, “I wouldn’t worry about it. We ran aground three hours ago. “