A few days before his proctological exam, a one-eyed man accidentally swallowed his glass eye. He was worried for a while, but there were no ill effects, so he forgot about it.
Once in the doctor's office, the man followed instructions, undressed, and bent over.
The first thing the proctologist saw when he looked up was the glass eye staring back at him.
"You know," said the doctor, "you really have to learn to trust me."