The Book of Gord!
My favorite entry:
The Book of Wrath
Don't Touch! Its Dangerous!
Once upon a time Gord had a friend named Mike. And this friend named Mike had been given a Gameshark. Only this GameShark was not a normal Gameshark, it was evil and possessed dark spirits within!
It had a curious gift. This particular GameShark would blow out the PlayStation motherboard micro-fuses rendering the expansion port inoperable.
At the time, no thought was given to harnessing this power for evil.
A few months later a customer had brought in a GameShark that did not work. Gord tested it, found it did not work and in fact blew our the micro-fuses like the Mike's GameShark did.
This time, an evil idea was born!
"I'll give you $5 for it."
Gord buys the GameShark.
Then Gord left it on the counter begging to be stolen! Far from the computer where Gord completed his transactions, and conveniently hidden from his sight by a flyer folder. Would-be thieves would count their lucky stars at how tempting this target was.
And finally a couple weeks later, it was stolen!
Gord was a happy Gord. Not only would it not work, but it would blow out the expansion port of any machine it was plugged into.
Over the next three weeks, Gord went from fixing no expansion ports for customers ever to more than ten during that time. Gord's retribution was at hand, and the GameShark was doing its job well. This exercise was very profitable for Gord.
Note: For those of you who are unaware, a Gameshark is essentially a hex debugger/editor for the original Sony Playstation (and other platforms). Most people use codes from a little book that comes with it, or get codes from the internet; you can, however, use it's functional capabilities to pause the game, and look all across the machine's memory for specific values (lives or hit points remaining, etc.) and alter them. Of course, there is no OS running (the Gameshark is actually a hardware extension that can preempt real mode code execution); thus, you can even alter the game's microcode while it is resident in memory! Of course, if you don't know exactly what you're doing, the game crashes when you return to normal execution. Because of this, 99.9% of people think that these really are "magic codes", left in by the game developer or Sony itself, and then sold to the company that makes the Gameshark.
For you NES old schoolers out there, Gameshark=Game Genie. Game Genie, Pro Action Replay, et al work on the same principle; some models/platforms don't include the debug functionality due to limitations of licensing and hardware. I believe there was even an ISA card for old PCs that would allow you to do the same thing (though you could just use the actual "debug" program included with DOS until Win9x for the same thing; if a game+device drivers used all/most of the bottom 640K, you were out of luck and needed the card, or OS/2 Warp).