K-K-K-K-O-O-O-R-R-R-N-N-N

After waking up from surgery, a still Bill summoned a nurse.
"How do you feel?" She asked.
"Lousy. I want to register a complaint. During the surgery I heard the surgeon say a four letter word. It disturbed me greatly."
"I'm so sorry sir. What was the four letter word?"
"OOPS."