Mr. Time: "Yeah, I have an appointment tomorrow, and I need to move it to Friday."
Dr. Grumpy: "Hang on..." (turns on iPod) "uh, you're appointment is on Friday, March 19th"
Mr. Time: "Oh. So is that the next Friday, or the following Friday?"
Dr. Grumpy: "It's Friday, March, 19th, 2010. I'll tell you the specific date to keep it clear."
Mr. Time: So when did you move it to Friday? How did you know I'd need to do that?"
Dr. Grumpy: "You must have. We don't do that."
Mr. Time: "Friday is good for me. Would Monday work better for you?"
Dr. Grumpy: "Friday is fine. See you then. Have a nice day."