system
Given the following post, respond as if you're commenting on Reddit:
human
[Game of Thrones/ASoIaF] My name is Lancel Lannister. In some bizarre fit of hyper-competence I come back seven minutes later with the breastplate stretcher King Robert wanted. How does the story change?
gpt
Sadly, very little. By that time, Lord Stark has already persuaded the King to not ride in the tourney. Bobby B remains a shouty drunk, he's just a shouty drunk who can fit in his armour. He doesn't wear the armour for his boar hunt, because why would he? So ~~Cersei's plan to have you get him too drunk to survive a face-off with an angry pig~~ the tragic accident happens as normal, war breaks out, and eventually you die a fiery death along with hundreds of others when Cersei blows up the Great Sept.

\*\*\*

Of course, if your hyper-competence continues beyond finding the breastplate stretcher, things have the potential to go very differently.

When Stannis attacks King's Landing, you fight with not just courage but also great skill, cutting down a dozen or more of the enemy as you fight by the Hound's side. When Clegane turns craven, you remain steadfast, joining the Imp in his counterattack - and being credited with leading it, because nobody expects anything of Tyrion. Your deeds merit a suitable reward - immediate knighthood, obviously, and greater responsibility - the promise of a noble title of your own, and a command against the Young Wolf. This will take you away from the capital, and from Cersei's ~~bed~~ influence.

With the Lannister name and constant displays of exceptional competence, you rise high in Lord Tywin's favour. With Jaime missing, you are the natural choice to become his new commander in the Riverlands. A man who can find a breastplate stretcher in under seven minutes can be sure of finding an army of Northmen, bringing them to battle - and putting them to flight.

So now you have Robb Stark as your prisoner, and half his great lords beside. Among them is Roose Bolton, who claims to have been a secret ally of Lord Tywin. But a man as competent as you can tell a snake when it's coiling about his hand, so you are never fool enough to trust him. Instead of sending him back to the North to take power, you make him accompany you to the capital, to swear allegiance to King Joffrey.

Sadly, even a man as brilliantly competent as you cannot make the journey to King's Landing with all your prisoners in time to prevent Joffrey's poisoning, but it is immediately clear to you that the Imp cannot have acted alone. You quickly launch an investigation, determined to root out the conspirators. The Tyrells are smart enough to see the writing on the wall, and flee the city, but you are quick in pursuit, and intercept the murderous Queen Margaery, her fool of a father, and his harridan of a mother before they can reach Highgarden. They are brought back in chains. For regicide there can be only one punishment - death.

Unfortunately, while you were distracted with bringing the real killers to justice, Lord Tywin and Queen Cersei have continued their vendetta against their kinsman, holding a trial by combat while you were on the hunt, and the Imp has murdered his own father before fleeing the city. With the city in chaos and the King a mere child, a new Hand is urgently needed - and there is only one man who has consistently shown himself to have competence above all others, his skills beyond reproach on the battlefield and at the negotiating chamber, wise in judgement, courageous in combat, indefatigable in the pursuit of justice.

And that is how Lancel Lannister, the Hyper-Competent, became one of the youngest ever Hands of the King, before his 17th name day. All because of a breastplate stretcher.