Patient: "I see that your badge says MD. Do you have a PhD as well?"
Me: "No, I don't. Just the MD."
Patient: "Oh. You think you'll go for your PhD?"
Me: "No, I don't think I will."
Patient: "I guess an MD is good enough."
Me: ".... you know, MD stands for medical doctor."
He then proceeded to call me by my first name for the rest of the visit.