RE: Safest way to buy online by credit card (Computer bloopers and blunders from the technically clueless)
In the old days of floppy disks I gave a teaching colleague some learning materials I'd saved to disk. She rang to say the disk was empty, useless, or so faulty the computer wouldn't even read it. I was puzzled until I discovered she was putting it into the disk drive SIDEWAYS. And this woman was teaching word-processing at the time!