A girl walked into the computer center where I work. She said she was having problems with her Mac. I asked what kind of Mac she had. In an indignant voice, she replied, "Duh, Intosh."
Tech Support: "What operating system are you running? Windows 95?"
Customer: (a little too excited) "95, 97, 98, I've got them all!"
After conferring with her husband, it turned out she owned a Macintosh with System 8.1.
A customer called in with modem problems.
Tech Support: "Ok, we're going to check your modem settings. First thing we need to do is make sure all programs are closed."
Customer: "How do I know if everything is closed?"
Me: "Make sure all windows are closed."
Customer: "But...I'm in the basement. I don't have any windows here."
Lucky me, I made it to the the mute button in time!