The new Trainee

A man joined a big Multi-National Company as a trainee.
On his first day he dialled the pantry and shouted into the phone, "Get me a coffee quickly!"
The voice from the other side responded,
"You fool you've dialled the wrong extension! Do you know who you're talking to, dumbo?"
"No", replied the trainee.
"It's the Managing Director of the company, you fool!"
The man shouted back,
"And do you know who YOU are talking to, you fool?"
"No.", replied the Managing Director.
"Good!" replied the trainee and put down the phone!