Jokes about look out in English

I went to the hospital and found the doctor: "Doctor, my illness has recurred."

The doctor said, "Show me the case first."

I gave it. He stared at the case for five minutes, then frowned, then thought.

I asked weakly, "Doctor, there is still help."

The doctor coughed twice: "Well, I remember writing your case. Why can't I understand what I wrote now?"