From one of my favorite sites- notalwaysright.com-
Tech Support | Liverpool, UK
(Back when they were common technology, we sent out a software update on four floppy disks.)
Customer: The computer says its unable to read disk two.
Me: Can we start the installation again just to check it is the disk that is the problem, please? Put the disk in the drive and type a:update. Then, press enter.
Customer: Okay. It says its unable to read disk one now.
Me: Im sorry. Did you try that with disk one or two?
Me: No, sorry. Just then, not earlier. Was the disk in the drive disk one, or two?
Customer: Both. Both disks are in the drive. Why? Was I supposed to take the first one out before putting the second one in? It didnt say to do so, just to insert disk 2.
Me: Youve got two disks in the drive at the same time? That mustve been difficult to manage.
Customer: Not when you hit the second one with an encyclopedia.