We sold a new Pentium to a new customer. After only a day or two it was back in
the shop. She was complaining about many errors she was getting in Windows: a
number of general protection faults, disk read/write errors, etc. We brought the
system to our shop, ran some tests...everything checked out fine, so we sent it
back.
Again a call came in from her, complaining about the same errors. We ran some
tests, everything was fine, and we sent the machine back. By the fourth call, we
decided there must be something in her office that was causing the problems, so
we asked her about microwave ovens, etc. Nothing like that was anywhere near her
computer, according to her, so we sent a technician over to take a look. After
five minutes on site the system worked fine. The technician removed the two
dozen or so refrigerator magnets that she had been decorating her computer with.