A man comes into the ER and yells "My wife's going to have her baby in the cab!" I grabbed my stuff, rushed out to the cab, lifted the lady's dress, and began to take off her underwear. Suddenly I noticed that there are several cabs, and I was in the wrong one.

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.

During a patient's two-week follow-up appointment with his cardiologist, he informed his doctor that he was having trouble with one of his medications.
"Which one?", asked the doctor.
"The patch. The nurse told me to put on a new one every six hours and now I'm running out of places to put it!"
The doctor had him quickly undress and discovered what he hoped he wouldn't see. The man had over fifty patches on his body! Now the instructions include removal of the old patch before applying a new one.

I am a medical student currently doing a rotation in toxicology at the poison control center.
Today, this woman called in very upset because she caught her little daughter eating ants. I quickly reassured her that the ants are not harmful and there would be no need to bring her daughter into the hospital.
She calmed down, and at the end of the conversation she happened to mention that she gave her daughter some ant poison to eat in order to kill the ants. I told her that she better bring her daughter in to the ER right away.