Prescience Is Predictable

""It has occurred to me more than once that holy boredom is good and sufficient reason for the invention of free will.""

- Leto Atreides II, God Emperor of Dune

Have you ever been in line to a movie, and someone else blabs the end? Or worse, you overhear the plot of the entire movie? After tossing a sled at the blabber, you now have to sit through a movie you will not enjoy as much or be as surprised at. Annoying, isn't it? Now imagine that you had the power to see the future in such exact detail that you are effectively The Omniscient. Not only would you live a life with no surprises, but you'd know things no sane person should. You'd know the names of all your children, when and how they'll die, and if the laws of the universe make it impossible to change what has already been predicted, you'll be powerless to stop it.

It's actually worse if someone is capable of any kind of action. You know everything about the future? That means you already know if you will attempt to avert the future. You already know how this attempt will turn out. You already know what you will think when you make the attempt. In fact, it will be utterly impossible for you to even think of doing something different. You will think what you will think, and you will do what you will do, and you already know what they are. And you will scream what you will scream.

And so it goes for some oracles and superpowerful intellects. They often go mad from the knowledge, their inability to affect the future, and the sheer monotony of it all, and thus turn into fatalistic Nietzsche Wannabes who have Nothing Left to Do But Die; If the future is at all malleable, they will become obsessed with unpredictability, living a life of screwing destiny to its most extreme and setting greatly chaotic events in motion just so that the outcome can become unpredictable even to them. Even sane oracles will quickly don Jade-Colored Glasses in self defense.

Compare how the Living Lie Detector is often fascinated by the Consummate Liar. Contrast Scry Versus Scry and Xanatos Speed Chess, which have oracles who are anything but bored.

Anime

 * Baccano! has a notable example.  has this power, noted its drawbacks, and turns it off.
 * Knight Templar slash Well-Intentioned Extremist Enrico Pucci seeks to invoke this in Part 6 of Jojo's Bizarre Adventure. His belief is that if mankind already knows what their futures hold for them, there will be no more reason for war or suffering, since all the uncertainty will be taken out of life. In order to pull this off, Pucci
 * This is what Eriol claims was Clow Reed's motivation for setting events in motion to pass his powers on to Cardcaptor Sakura. Tsubasa Reservoir Chronicle and xxxHolic, however, present an altogether different reason.
 * Narumi Kiyotaka from the Spiral manga, even more obviously bored in the prequel Spiral: Alive. It is hinted that the events of the manga happen because he was just too bored, and stated to be the reason he acts like an idiot and does ridiculous things such as dressing up in furry costumes: to spice things up in his boring life. Although his ability to predict everything is presented more as a form of incredibly high intellect than a supernatural ability to see the future, he is still considered a "god" by everybody else., but Kiyotaka is so enigmatic it can be argued he knew and in fact arranged this outcome. There's no way to know for sure.
 * The interfaces from Haruhi Suzumiya. The desire to avert this is likely what drove Ryoko into the radical faction of the entity, and Kyon notes in the novels that Yuki becomes noticeably happier after she loses this ability.

Comic Books

 * Sort of example/subversion: The Midnighter has a huge amount of advanced circuitry in his head that allows him to run any battle a million times in his head, ensuring victory. The only two times he can't predict the fight, he's understandably shaken. (The first time, it's against a guy who does nothing at all, so he can't react; the second time, he's against the Joker, and has no idea what he's going to do.)
 * Dr. Manhattan in Watchmen. His reaction is to entirely stop caring what happens. When, he becomes excited, saying that he'd almost forgotten how wonderful it was not to know what was going to happen next.
 * It's never made clear whether or not he has no ability to change the future, however. Because he stops caring about the passage of time and life, he never attempts to: so you get scenes wherein he entertains the idea of interfering but doesn't specifically because he's already seen he doesn't, rather than because he can't.
 * In Runaways Niko
 * In one incarnation of the Doom Patrol, one of the men who goes by Negative Man can see a short distance into the future. He believes he can't change what he sees, and thus is understandably cynical.
 * The title character of the near-future gangster comic Skreemer had seen his whole future by the time he was in his teens, including who he would marry, who would betray him, and how he would die. This led to him taking outrageous risks (such as a home full of balconies with no railings, or walking through hails of gunfire). It also backfired in weird ways, such as when he told a loyal henchman that he knew he'd turn traitor—so the henchman did so, thinking it was what Skreemer wanted.

Film

 * Brendan Fraser's character from the The Air I Breathe is a mob enforcer who has the ability to see into the future. He seems to be thoroughly depressed by his being nothing but a witness to coming events, unable to help.

Literature

 * Most notable literature example is probably the God-Emperor Leto Atreides II, of the Dune novels. His plan, over three thousand years of his life is to influence human breeding so as to create a human whose actions cannot be predicted by precognitives or prescients. Bear in mind this is mainly because Leto has calculated all possible futures and this course is the only way to prevent the extinction of humanity.
 * Even before that, Leto's father Paul discovers the terrible truth of being an Oracle - the more a prophetic vision is fulfilled, the harder it is to avoid the rest of the vision, effectively being locked into it. It becomes worse after he becomes blind, and deals with the handicap by moving lock-step with his vision without any deviations. Eventually he realizes that the vision he had at first accepted wasn't such a great idea after all, and in the end he sacrifices his powers rather than see his vision out to its ultimate conclusion. It takes his son Leto II to work his way around this by merging his father's already in progress vision with several new ones played out for a few thousand years.
 * A slightly different take involves a weakness of the Spacing Guild. Because they us FTL travel, but don't have FTL sensors, navigators use prescience to choose a safe course. This leads them to use their other applications of prescience in the same way, choosing the safe course and not realizing others would choose the riskier way.
 * This is ultimately  undoing.
 * Averted in Slaughterhouse-Five. Although the Tralfamadorians see the past, present, and future as one, without any possibility of changing the future—and Billy Pilgrim, Unstuck in Time, comes to see time this way too—they accept it with equanimity.
 * Timequake, also a Kurt Vonnegut novel, plays it straight, though. The world had a kind of existential crisis and skips back to ten years ago. Everyone has to replay the last ten years, doing everything exactly the same as they did last time round but aware of what's going to happen.
 * Evanna the witch from The Saga of Darren Shan has this, and has taken a neutral stand on most things. Though, when she realizes that
 * The Clayr in The Old Kingdom, by Garth Nix, like it when things go this way. They initiate new girls into their ranks because - they had a vision showing that girl in the initiation ceremony! However, if the future becomes more and more difficult to see, that means more and more things are likely to go wrong... or that there may not be a future.
 * There is a story by Francis Carsac, in which the main character travels to a planet whose native population is slowly dying off from apathy. Nobody can figure out why. He eventually meets with another human who reveals that there is a hidden device that captures anyone who comes near and shows them their future in its entirety before letting them go. Worse, the natives consider it a rite of passage, so all of them go on a pilgrimage to the device. The man also reveals that he is supposed to die the same day. He is accidentally shot minutes later. The protagonist travels to the device and, predictably, is shown his own future. However, the device is almost out of power, so the vision is soon all but forgotten. He still remembers the name of his future homeworld, the death of his lion companion, and he death of the woman he loves. Even knowing the truth, he still goes to that planet, where all these events still happen (in another novel). The device turns out to be planted by Abusive Precursors who were about to die out, and were determined to allow no other race to take their place. (That's what they did to the less advanced planets; the more advanced ones were nuked outright.)
 * This is the reason that Good Omens' Anathema Device destroyed the book of prophecies left to her by her ancestor at the end of the book.
 * Though admittedly, knowing Agnes Nutter, the book was probably blank (or addressed to whoever ends up reading it).
 * Death from the Discworld series remembers everything. Everything that has happened or will happen.
 * Yet he doesn't have a clue when Rincewind is going to die?
 * He doesn't even know what Rincewind is anymore. He's had so much happen to him.
 * It's mentioned that entities like gods and demons are technically timeless, but in practice live from day to day because it's so confusing otherwise. Death may do this as well, though to a lesser degree.
 * Though we never meet him, a central character in one of the Callahans Crosstime Saloon stories, 'Fivesight,' has this in spades. He can see the future, but only the bad things, and he can do nothing to stop them from happening. Not the gruesome death of his lover's son, not their breakup, and not

Live Action TV

 * An episode of The X-Files had a guy come from the future to kill himself before he can invent his Time Travel technology, and evokes this reason in a Motive Rant.
 * In the Fringe episode "The Plateau," a man is shown deliberately setting a pen on a mailbox, which serves as the catalyst for a chain of events resulting in catastrophe. It later turns out the man was.

Radio

 * Played with in an episode of Old Harrys Game, where God is feeling depressed because everything is so predictable. He only snaps out of it once the Professor points out that God didn't know he was going to get depressed.

Tabletop RPG

 * Tzeentch, the god of Xanatos Roulette from Warhammer 40000.
 * He seems to control his boredom by setting up a dozen plans at once and watching them crash into each other and spray shrapnel everywhere.
 * Technically, Tzeentch doesn't see into the future, any more or less than any of the other partially-precognitive Chaos Gods do. He, however, can calculate virtually every outcome of everything going on, in the entire galaxy. Constantly. He DOES have a Greater Daemon that can see the future... Because he threw it into the "well" that was the literal axis of all of time. It emerged with two heads, one that always spoke the truth of the future and one that constantly states the opposite. They switch roles unpredictably. He has a dozen OTHER demons constantly writing down the unending, insane gibbering, to try and glean what he can of what's to come.
 * Inspired by Emperor Leto in Dune, the Emperor of Mankind was also able to see the future. He was also immortal (to the tune of over thirty-seven thousand years old) so his plans could afford to be very long-term. Around the time of the Horus Heresy, however, his precognitive abilities were starting to become unreliable, even outright fading, to the point he didn't realize Horus' betrayal was imminent, nor that he was taking half the Space Marine Legions with him. Turns out, as you should know, this is probably due to his being nearly killed at the pinnacle of the Imperium-splitting civil war.
 * Every spanner in Continuum is subject to this, because their model of time travel says You Can't Fight Fate (though Narcissists disagree). Some try to avoid learning any more about their Yet than they have to.
 * Odin was cursed with this in Scion: every time he uses the power of Prophecy in order to attempt to avert Ragnarok, another piece of the future leading to it will be placed in stone. The curse was designed to stop him from abusing prophecy so much; at this point, the god who put the curse on him is in a total panic, because he didn't think Odin would ignore it the way he did, and now he wants to stop Ragnarok as well...

Videogames

 * Trenia from Makai Kingdom is basically the soul of the Sacred Tome that happens to be a Cosmic Keystone that records the netherword's history... in advance. Sure you can write a wish in the thing and alter reality, but you've gotta have thumbs for that, y'know? So when Zetta takes up her position in the opening, she thoroughly enjoys direct interaction with things, even though she still knows what will happen.
 * Fateweavers in Kingdoms of Amalur Reckoning don't actually weave Fate as their title might suggest. They can only see a person's fate, which cannot be changed. The first Fateweaver you meet, Argath, was originally a famed adventurer and hero who thought becoming a Fateweaver was an honor. Then he read his own Fate and saw his own inescapable death: as the main ingredient of an ettin's stewpot. He started drinking pretty heavily after that.

Web Comic

 * The Master AI 'Oracle' from SSDD is very close to this, engineering chaotic and unlikely events solely so he can observe the unpredictable outcome... rather than being caused by boredom, however, it's part of his basic programming: To observe matters in order to sharpen his own ability to predict future events. He just concluded that to improve his abilities further, he needed more chaotic and unusual events... and set about creating them.
 * In El Goonish Shive, this appears to be the main motivation of the shape-shifting Immortal entity dubbed 'Chaos' - she(?) hates predictability and influences events only to make them more chaotic and unpredictable. She helped the good-guys on several occasions, simply because she knew they'd lose otherwise - and she refuses to help the bad-or-not guy escape from his prison, since the only thing she really cares about is NOT knowing when, and if, he'll be able to escape. She only provides occasional hints, to keep him from giving up ('cuz that would be boring...)
 * She broke this rule of hers recently, but that was as part of her Berserk Button. FYI: Don't fuck with her son. It will end...poorly.
 * Sarda of Eight Bit Theater often complained about the conversations he has with people because he already knew how they've turned out, and they were boring then. (Plus, having several billion years to muse them over probably hasn't done well by his sanity)
 * Aradia Megido from Homestuck has this in spades, thanks to her communion with the dead and later time powers. She is convinced they are all doomed and nothing they do can change this. She at one point considers killing Karkat just to create a divergent timeline that won't save them either. (Karkat is not amused.)
 * Played with in Girl Genius, from Othar's Twitter account. A girl from Paris volunteered for an experiment, but was basically stuck in mental time travel. For everyone outside, it was maybe an hour, but for her and the others inside the experiment, it was a thousand years. During that time, the girl predicted every event that would happen if she tried a heist, and was correct, until Othar got massively drunk.
 * Juno from Atomic Laundromat. She takes up working in the laundromat because it will be the site of something she cannot foresee.

Western Animation

 * American Dragon: Jake Long gives us the Oracle Twins. One of them always sees bad futures, and has become so used to hearing bad news that everything makes her bright and perky. She is not an example of this trope. The other sister, however, only sees good futures, and in the spirit of this trope acts unenthusiastic all the time due to having all of the surprises taken out of life.
 * The protagonist of All Dogs Go to Heaven discovers a book in which all his future actions are written, and learns that in heaven, there are absolutely no surprises. The book didn't predict that he would flee heaven because of this.