Employee over phone to the Manager

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...