Doctor: "I'm sorry, but you suffer from a terminal illness and only have 10 to live."
Patient: "What do you mean 10? 10 what? months? weeks?"
Doctor: "9, 8, 7..."
Terminal Countdown
Explanation
Explain Bear
Listen up, Wade, you're about as sharp as a marble. The doctor is being a smart aleck and counting down the patient's last moments *instead* of clarifying the duration. It's funny because it's unexpected and completely dismissive of the patient's very reasonable question. People are supposed to die eventually.