doctor jokes

Patient: "It's been one month since my last visit and I still feel miserable."

Doctor: "Did you follow the instructions on the medicine I gave you?"

Patient: "I sure did. The bottle said 'keep tightly closed'."

Nurse: "How old are you?"

Patient: "None of your business."

Nurse: "But the doctor must know your age for his records. Please, just tell me, I'm going to find it out anyway."

Patient: "Well, first, multiply twenty by two, then add ten. Got that?"

Nurse: "Yes. Fifty."

Patient: "All right, now subtract fifty, and tell me, what do you get?"

Nurse: "Zero."

Patient: "Right. And that's exactly the chance of me telling you my age."