A Doctor, a Nurse and a Shredder

A nurse was leaving the hospital one evening when she found the doctor standing in front of a shredder with a piece of paper in his hand.

"Listen", said the doctor, "this is important and my assistant has left. Can you make this thing work?"

"Certainly", said the nurse, flattered that the doctor had asked her for help.

She turned the machine on, inserted the paper and pressed the start button.

"Excellent! Excellent!" said the doctor as his paper disappeared inside the machine.

"I need two copies of that"