Mary: "Hi, Mrs. Bulova. This is Mary, at Dr. Grumpy's office. I'm calling because you're 10 minutes late for your appointment, and you're always punctual. So I wanted to make sure everything is okay."
Mrs. Bulova: "That can't be! My appointment is at 2:30, and my watch says it's only 1:15 now!"
Mary: "I'm sorry, but it's actually 2:40. I can re-schedule you, though. Maybe your watch is broken? Or you need to wind it?"
Mrs. Bulova: "It's funny, I noticed last night that it said 1:15 while I was having dinner, and it said the same thing later when I was getting ready for bed, and also this morning, when I woke up. I thought that was weird, but it makes sense now."