Trainee in a Multi National Company

A man joined a big Multi National Company as a trainee.. 

On his first day, he dialed the kitchen and shouted into the phone:
"Get me a cup of coffee, quickly!" 

The voice from the other side responded: "You fool; you've dialed the wrong
extension! Do you know who you're talking to?" 

"No" replied the trainee. 

"It's the Managing Director of the company, you idiot!" 

The trainee shouted back: "And do you know who YOU are talking to, you
IDIOT?" 

"No!" replied the Managing Director angrily. 

"Thank God!" replied the trainee and put down the phone.......