The Call Has Bad Reception

Some heroes aren't born, they're made. Some calls don't make it to the right person the first time. And then there are those times when The Chosen One is up to the challenge, and The Call goes out to the right person, but somehow...there's a communication problem somewhere. The Precursors give the magic staff to the Chosen One to wish away evil and heal the sick, but the instructions get screwed up, and the One winds up using it as a bludgeoning tool to club criminals and a pestle to mix medicines. The magic book is given to the Chosen One to execute a myriad of magic spells, but the Chosen One isn't that good with magic, so they wind up using just the one spell in a number of innovative ways. The Chosen One may receive a tablet that he translates as requiring him to perform a certain action, but his translation is off, and the action he thinks the tablet requires them to perform is the action that he is being specifically requested not to do.

This trope is about situations where the Hero is pure, and the Call is for great justice, but for one reason or another, miscommunication occurs that causes the hero to perform less than admirably at his task. A few things to note:
 * 1) There actually has to be a call to adventure involved. Someone imagining the call doesn't count.
 * 2) The call has to have good intent, and cannot lie to the hero. There are some tropes that involve the hero being lied to in order to get the hero to do bad things. This is not one of them.
 * 3) An Idiot Hero cannot be involved. The issue here is that the problem is the fault of the instruction giver, not the hero. If the hero is of the sort that, if he knew exactly what he had to do, he would still screw it up, then it doesn't count.
 * 4) Half-truths, pretend-truths, and the like do not count. Even if the person sending the hero on the mission purposely tells the hero half the story with good intent, because the very act of telling him the whole story would immediately doom the hero to failure, then it doesn't count.

Anime and Manga

 * This is the driving force of the plot of Giant Robo: The Day the Earth Stood Still. The succinct version of the saga is thus: young Emmanuel Von Volger walks in on his father unsuccessfully attempting to stop an experiment that winds up destroying an entire country. His father shuts himself into a room for days, until he stumbles out of his room, randomly babbling that Emmanuel should stop the scientists he worked with at all costs, and hands him the tool he needs to do it before dying. As Emmanuel delivers what he believes is the death stroke to the entire world, the truth is revealed via hologram: By this time Emmanuel has screwed up so badly that there's nothing left for him to do but kill himself.
 * The first half of Magic Knight Rayearth is founded entirely on this.

Comic Books

 * In some versions of Green Lantern, the recipient of the ring gets it with little to no instruction, only to be told "you'll know what to do when it's time." Most notably Justice League: The New Frontier.
 * Kyle Rayner's first days as a Green Lantern is a good example of this: Ganthet shows up after Hal Jordan goes nuts, gives Kyle the ring saying "You'll have to do." and disappears. Things are all fun and games until Major Force shows up...
 * This happens in Fray because of Unto Us a Son And Daughter Are Born. Melaka (the girl) got the strength but NOT the inherent slayer memories/psychic stuff, which went to her brother Harth. Which is even more awkward when he becomes a vampire.
 * In Erfworld, the King buys a spell to summon the "perfect warlord", but is too cheap to pay for it to be cast professionally, so his in-house caster does her best, and summons pudgy war-gamer Parson Gotti, to his great disappointment. Parson turns out to be uniquely talented for the position, having studied turn-based games for most of his waking life.

Film

 * In The Matrix, the call has excellent reception - until Neo drops the phone off of a building. This, combined with how dangerous the last instruction it gave him was, leads him to be captured by the Agents.
 * This is the basis of the plot of the Christopher Nolan film
 * In the movie White Noise, Michael Keaton's character is able to make contact with his dead wife, who he thinks is telling him about future tragedies in order to stop them. This belief is strengthened by the fact that she says things like "go now" and "leave now" after hearing and seeing future tragedies. In this one, the Call literally has bad reception, as it turns out that
 * Knowing: the aliens send messages regarding future disasters to earth, supposedly in order to prepare them. However if the first recipient in the movie is any indication, nobody really understood the message in and of themselves, and the people who got it just went crazy.
 * Happens in The Order. Heath Ledger is a genuinely good priest who just wants to exorcise demons and get rid of the Sin Eater.

Literature

 * Prior the Mistborn series, a prophesied hero went on a quest to destroy a great evil, but gave into temptation and became a living god instead.
 * Happens literally in Monster. Judy is the Chosen One destined to save the universe, but her reception with the universe is rather crappy, leading to the universe consistently screwing up her life.
 * The War Gods: Tomanak doesn't like to lead his champions by the hand, so he generally nudges them toward where he wants them. Also, in the beginning Bahzell has only a vague notion that he's supposed to be heading west, and turns east when he realizes he's getting the call.
 * In the third book of Tamora Pierce's The Immortals quartet: the heroine, Daine, is given the power to temporarily raise the dead. The person giving it to her, however, forgets to tell Daine that she is getting this new power, or how to use it without half-killing herself. Daine is disturbed to find that skeletons start moving when she touches them. This isn't an exact example, as gaining the power of necromancy was not the first or even the most important Call to Adventure Daine receives.
 * In The Grand Tour, the sequel to Sorcery and Cecelia, it is revealed that Kate, who had previously come across as the Distaff Counterpart to Badass Normal James, has just as much magical talent as her cousin Cecelia, but has no interest in developing it. In The Mislaid Magician, she uses this power to find her husband and children and to keep her hair up. To near-deadly effect.
 * In The Wheel of Time, the Guide noted that in the Age of Legends, many people had themselves tested for aptitude in the One Power, but failed and never took a second test, leaving their hidden potential untapped.
 * In Wizard's Bane by Rick Cook, hacker (in the sense of ace programmer) Wiz Zumwalt is called into a parallel universe where magic rules, but he knows no magic, to the intense disappointment of the apprentice of the wizard who summoned him.
 * This is one of the big themes during the first half of Harry Potter and The Deathly Hallows. Even though Harry knows what he needs to do in order to kill Voldemort, Harry has no earthly idea over how to go about achieving this.. His only source of information are very cryptic clues left by Dumbledore. This veers into a Deconstruction when Harry has a falling out with Ron, who's pissed because he expected Harry to actually have a gameplan.

Live-Action TV

 * This was the basic premise of the TV series The Greatest American Hero: Sufficiently Advanced Aliens deliver a supersuit to earth, but the young man who gets it loses the instruction manual, and thus has no idea what it can do or how to use it effectively.

Tabletop Games

 * This certainly never, ever happens as a standard hosejob in a game of Paranoia. Your mission briefing will never come out of a Computer printer garbled, a transbot will never roar by when The Computer is telling you the location of your briefing room, important details are never Deleted For Security Reasons, your mission will never get accidentally mixed up with the week's food vat assignments... The Computer Is Your Friend, Citizen. Have a nice daycycle!

Western Animation

 * Nine: Happens with the soul talisman,
 * Transformers: The Movie '86. The Matrix is to be used by the Chosen One to light the Autobots' darkest hour. Problem is, no one knows who the chosen one is, and they just assume that it is whoever the leader of the Autobots happens to be at the time. They also don't know exactly when their darkest hour will be, which isn't helped by the fact that in this movie the Autobots day can be summed up in 3 words: It Got Worse. This results in Optimus Prime being killed, and Ultra Magnus getting killed while attempting to use the Matrix. Eventually it is revealed that Hot Rod is the one to open the Matrix, and their darkest hour is when Unicron tries to destroy Cybertron.
 * Although another example may come in the television series, and the two part "Return of Optimus Prime." In that case, the "Darkest Hour" in question was the release of the Hate Plague, which not only endangered the Autobots and Decepticons, but all sentient life in the cosmos. In that case, the Matrix was also used to light their Darkest Hour. It's just that the chosen one was dead at the time, and had to be revived before he could use the Matrix to save the day. And in fitting with the prophecy where "All are One," at the end the hostilities between the different factions were resolved. At least for the time being.
 * According to Word of God, in Avatar: The Last Airbender, the Team Normal Sokka apparently had water-bending potential just like his sister, but his skeptic nature meant that he never developed it. However, he makes up for this by being The Smart Guy and being really good with a boomerang, and a sword. And invasion strategy, though don't get him to try and explain a plan to an audience.