A coworker told me this story about his mother. She was planning a visit and was concerned about being able to work on something or other. To the best of my recollection it went as follows:
Mom: Do you have a wireless modem at your house?
Son: No, mom, I don’t.
Mom: Well, how am I going to use the Internet?
Son: You can use my computer.
Mom: You don’t have a computer, you have a Mac.
Son: That is a computer!
Mom: Oh, I thought it was just a word processor.