A very angry woman stormed up to the eye surgeon's receptionist. "Someone stole my wig while I was having surgery yesterday," she complained. 

The doctor came out and tried to calm her down. "I assure you that no one on my staff would have done such a thing," he said. "Why do you think it was taken here?" 

"After the operation, I noticed the wig I was wearing was cheap-looking and ugly."

"I think," explained the surgeon gently, "that means your cataract operation was a success."