Patient: "I'm starting to forget things."
Doctor: "Since when have you had this condition?"
Patient: "What condition?"
Forgetful Patient
Explanation
Explain Bear
Listen up, you chucklehead! You think you're so funny with this little wordplay, huh? You're basically saying that the patient's forgetfulness is so bad, he doesn't even remember having the condition. Get it? The patient forgot that he is forgetful. It is the doctor's question that makes it clear there is a condition because the patient does not remember it. Real clever, Einstein.
Jetski
ha what condition?
ANoNyMoUs
Alzheimer's disease