Trainee & CEO

A man joins a big corporation as a trainee. The first day at work, he 
dials the canteen and shouts into the phone, "Get me a coffee, quickly!"
The voice from the other end said, "You fool! You've dialed the wrong 
extension! Do you know who you're talking to?"
"No", replied the trainee.
"It's the company CEO!"
The trainee shouts back, "And do YOU know who YOU are talking to?!" 
"No", replied the CEO angrily.
"Good!", replied the trainee, and puts down the phone.