Check Disks

Customer: "I am getting an error on my computer"
Tech Support: "What kind of error?"
Customer: "It says I have a corrupted file on my hard drive, and I should run 'Check Disk'."
Tech Support: "Ok, we need to call in a ticket, and someone will be down shortly."
Customer: "Can you make sure you bring some extra Check Disks, because mine does not work."
Tech Support: "Uh. We're out of stock right now, but I'll order some."