A young man decides it's better be safe than sorry and decides to take an early colonoscopy exam.
As he lay on his side on the table, the doctor got ready to do the examination.
As the doctor was going in, he looked at the young patient, smiled and said, "Don't worry, it's normal to get an erection."
The patient, embarrassed, stated earnestly, "But I haven't got an erection!"
"I was talking about mine."