Jokes with Monitors
On some monitors, the brightness can be turned all the way down to the point that the screen is simply black.. My beloved LG FLATRON 795FT is such a monitor. Turning the brightness all the way down leaves all of the vital signs on, but no information is displayed on the screen. This is the only joke that has been played on me that took me a long time to figure out. I was dancing around the computer, attempting all kinds of conjuring, checking all of the cables, but all in vain: all indications were that the monitor was working but, an image simply refused to appear. The only thing displayed was the monitor menu, but it never occurred to me to check the brightness and contrast settings. Finally, the trickster could no longer suppress his laughter, and revealed the root of the problem. I spent the days following this moment of infamy viciously trying to pay my tormentor back for the humiliation I had suffered. No one had ever been able to pull one over on me like this before.
Another little trick is to place a magnet somewhere out of sight behind the monitor. It works with old monitors only and not with LCD panels. This will create significant interference on the monitor, which will cause the user a bit of eye strain. The victim will badmouth the manufacturer, but will most likely never discover the cause on his or her own. None of the guinea pigs I have tested ever has. You should keep in mind, however, that not every magnet creates interference and not every monitor is susceptible to it. My understanding of electronics, unfortunately, is not strong enough to explain why this is the case.
If the victim does not discover the magnet on his or her own, you should remove it yourself after a short time. Otherwise, you could end up doing some real damage to the person's eyes, which is not a joking matter. Somebody's health is not something to joke with. Moreover, doing it periodically for short periods is much more effective.
Despite all of these health warnings, this joke is quite harmless when played with care. For the interference created by the magnet to damage the user's eyesight, the user must work at his computer eight hours a day without smoke or lunch breaks for a long time. For example, a large air conditioner (about two meters long, but I don't know how much power it consumes) is constantly on in the summer at the place where I work. The interference it creates on my monitor makes the image jerk like no magnet does. I have had to work like this for two years. Summers around here are quite hellish without an air conditioner, but it is a hell of a different kind whenever it is switched on. Still, after two summers of this annoyance, I have not gone blind or experienced any other eye problems.
All the same, just to be safe, do not keep the magnet in place for more than a half an hour. If the victim does not notice the flicker in this time, there’s no sense to the prank anyway. Even if the victim does notice the flicker and starts worrying, fretting and entertaining coworkers with searches for its source, it is not advisable to let the joke go on for more than an hour.
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