I was performing a complete physical, including the visual acuity test. I
placed the patient twenty feet from the chart and began,
"Cover your right eye with your hand." He read the 20/20 line perfectly.
"Now your left." Again, a flawless read. "Now both," I
requested. There was silence. He couldn't even read the large E on the top
line. I turned and discovered that he had done exactly what I had asked; he
was standing there with both his eyes covered. I was laughing too hard to
finish the exam.