dialed the wrong extension

On his first day on the job, the trainee 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, idiot!”

The trainee shouted back:

“And do you know who You are talking to, you idiot?”

“No!” replied the Managing Director indignantly.

“Thank god for that!”

Replied the trainee and slammed down the phone.