So you're never going to see those assholes again? Sweet.
Time to let them know what you really think of them! Tell the ex-girlfriend off, insult the constant jerk, rob the old neighbor, leave a surprise on the boss's desk, jack their last ice cream sandwich, whatever fits! They deserve it, and you're never going to have to live through the repercussions anyway.
Wait, what's that? You have a class with that ex? The jerk is your mentor's kid? You aren't moving or transferring after-all? You left your wallet in their freezer when you were stealing the ice cream sandwich?
This is when a character issues a So Long, Suckers!, expecting never to have to see the people they offend ever again, only to be forced to continue their acquaintance. Or even worse, seek their help. So now, they have to be on their best behavior, put up with all the same crap, and/or face the music for what they did, deserved or not.
May overlap with Off the Table, when the other party refuses to allow the bridge to be rebuilt.
Compare We Meet Again, We Will Meet Again, Where It All Began, My God, What Have I Done?, The Exit Is That Way, Who's Laughing Now? and Take This Job And Shove It.
Flatliners was pretty much all about this, when the characters fry their brain-cells in a medical experiment, only to be faced with their own consciences. To overcome their dilemmas, they all have to make amends somehow.
A good chunk of the third act of Iron Man 2 is spent with Tony trying to repent for his assholish behavior from when he was dying in the first two acts.
In the first Galaxy Games book, the whole world thought they were about to be wiped out by an incoming asteroid. So all the adults went crazy doing whatever - the teachers didn't teach, many of the main character's friends' parents quit their jobs and so on. After the asteroid was revealed to just be an alien spaceship they all had to try and get their jobs back and return all the stuff they bought on an impulse. This was easy for some, but others, it was noted, had quit their jobs by telling their bosses what they REALLY thought....
Live Action TV
In The Fresh Prince of Bel-Air, Will and Carlton trick Geoffrey into thinking he's won the lottery, causing him to cheerfully dance around and call everyone out before the truth is revealed. In a variation, while everyone forgives him (the boys take most of the blame) he's too embarrassed to return, and is the one that needs to be coaxed back.
Curb Your Enthusiasm is basically this trope as the concept for a TV show. Plots are as follows: Larry David horribly offends a minor character, then realizes he needs their help. Larry tries to make amends, typically fails on an epic scale.
In the Doctor Who serial Inferno, the Doctor thinks he's got his TARDIS operational, and he's about to leave. So he says (about the Brigadier, in front of him): "I've had about all I can stand of this pompous self-opinionated idiot here!" But when he dematerializes, he only gets as far as the rubbish tip, and walks back, covered in dust.
DOCTOR: Erm, Brigadier, my dear fellah, I wonder whether I could borrow a couple of your stalwart chaps to give me a hand in bringing the TARDIS back? It's landed in rather an inaccessible position.
BRIGADIER LETHBRIDGE STEWART: "Pompous, self-opinionated idiot" I believe you said, Doctor?
DOCTOR: Yes, well we...we don't want to bear a grudge for a few hasty words, do we?
Still, he gets off really easy for this trope - just a moment of embarrassment and slight crow-eating.
Cheers had an episode where Diane told off the gang, vowed never to return and left ... but forgot her purse.
In The Adventures of Brisco County, Jr. Brisco snd Bowler recruit Pete Hutter for a mission while he's in prison, promising a full Presidential pardon for all his outstanding crimes. He accepts and proceeds to piss off his cellmate. Then Brisco tells him that they have to talk to the warden and he should be out in a couple of hours...
A mild case in The Thick of It; Hugh has decided that resigning would be better for his long-term political career, and on his way to make the announcement, he says a few unpleasant things about his department and the staff. Predictably, his resignation is no longer necessary and he comes back, but nobody really bears any grudge because (a) while he was honest, he didn't say anything too hurtful or spiteful, and (b) most of them hate each other anyway and they all know it, and consequently everyone has a lot of experience with swallowing their dislike and working together to brace themselves for the next stage in the eternal Humiliation Conga which makes up their lives.
Married... with Children: When a rich man proposed to Kelly, Al quickly phoned his boss to do the bridge-burning, oblivious to Kelly rejecting the rich man in favor of a not-so-wealthy suitor.
In the final episode of Wings, Brian and Casey make plans to run off to a tropical island, and Casey takes this opportunity to tell off every person on the island, including her boss and random people in the park. Unfortunately, Brian has an attack of family loyalty and decides to stay and run Sandpiper Air for Joe (who's also leaving), leaving a horrified Casey stuck on the island (and working Helen's lunch counter).
A Late Night with Conan O'Brien sketch had La Bamba (the Butt Monkey trombonist of the house band The Max Weinberg 7) get a check for a large sum of money. To which La Bamba responds "Ha! I quit!" and try to tell off the performers. Right after leaving (and the audience cheering him off), Conan gets a phone call from La Bamba crying claiming that he spent all his money on gum and asking to come back. Conan lets him come back with no ill will (and then shows the outtakes from his phone call).
The first episode of the second season of Arrested Development, "The One Where Michael Leaves", is focused on Michael's attempts to leave his family for good, but repeatedly getting pulled back to them again because the circumstances, mostly the results of said family's actions, forces him to.
Subverted in Homestuck. Karkat thinks he's going to have to apologize to Vriska in order to get her to join the Red Team. When he finds out that Vriska's been kicked off the Blue Team, he instantly rescinds his apology, and apologizes to himself for even making it in the first place.
A story in The Simpsons Comic had Krusty the Clown leaving town to star in a movie, giving the crowd at the airport a few choice words about Springfield. The movie flops, and when he returns the crowd is more of a mob.
Subverted in South Park when Cartman finally pisses off his "friends" so badly that they end up ignoring him— making him think that he must be dead and stuck in Purgatory; and so he goes about trying to make amends for all the evil things he did, in order to get to Heaven.
Jem and the Holograms had too much of Eric's abuse while working on a movie they quit. Then they learn one of the foster girls at Starlight Foundation needed an expensive surgery to avoid becoming blind so they had no choice but to come back. Eric got Jerrica to agree to becoming his assistant as a condition to let Jem and the Holograms back.