Bill received a bill from the hospital for his recent surgery, and was astonished to see a $900 charge for the anesthesiologist. He called his office to demand an explanation.
"Is this some kind of mistake," he asked when he got the doctor on the phone?
"No, not at all," the doctor said calmly.
"Well," said Bill, "That's awfully costly for just knocking out someone!"
"Not at all," replied the doctor. I knock you out for free. The $900 is for bringing you back around."