Take the first sentence of a novel. After that sentence add "And then the dragons arrived."

Feel free to add a plot!
...and then the dragons arrived at CdM's hole.
On the 24th of May, 1863, my uncle, Professor Liedenbrock, rushed into his little house, No. 19 Königstrasse, one of the oldest streets in the oldest portion of the city of Hamburg. "Dragons!" he gasped.
Okay, not a book . .
In west Philadelphia born and raised on the playground where I s pent most of days, chillin' out, maxin, relaxin', all cool, t hen the dragons arrived outside of the school.
Late in the afternoon of a chilly day in February, two gentlemen were sitting alone over their wine and then the dragons arrived. (Uncle Tom's Cabin).
Thus have I heard. Once upon a time the Lord was staying at Râgagriha, on the Gridhrakuta mountain, with a numerous assemblage of monks, twelve hundred monks, all of them Arhats, stainless, free from depravity, self-controlled, thoroughly emancipated in thought and knowledge, of noble breed, (like unto) great elephants, having done their task, done their duty, acquitted their charge, reached the goal; in whom the ties which bound them to existence were wholly destroyed, whose minds were thoroughly emancipated by perfect knowledge, who had reached the utmost perfection in subduing all their thoughts; who were possessed of the transcendent faculties; eminent disciples, such as the venerable Agñâta-Kaundinya, the venerable Asvagit, the venerable Vâshpa, the venerable Mahânâman, the venerable Bhadrikal, the venerable Mahâ-Kâsyapa, the venerable Kâsyapa of Uruvilvâ, the venerable Kâsyapa of Nadi, the venerable Kâsyapa of Gayâ, the venerable Sâriputra, the venerable Mahâ-Maudgalyâyana, the venerable Mahâ-Kâtyâyana, the venerable Aniruddha, the venerable Revata, the venerable Kapphina, the venerable Gavâmpati, the venerable Pilindavatsa, the venerable Vakula, the venerable Bhâradvâga, the venerable Mahâ-Kaushthila, the venerable Nanda (alias Mahânanda), the venerable Upananda, the venerable Sundara-Nanda, the venerable Pûrna Maitrâyanîputra, the venerable Subhûti, the venerable Râhula; with them yet other great disciples, as the venerable Ananda, still under training, and two thousand other monks, some of whom still under training, the others masters; with six thousand nuns having at their head Mahâpragâpatî, and the nun Yasodharâ, the mother of Râhula, along with her train; (further) with eighty thousand Bodhisattvas, all unable to slide back, endowed with the spells of supreme, perfect enlightenment, firmly standing in wisdom; who moved onward the never deviating wheel of the law; who had propitiated many hundred thousands of Buddhas; who under many hundred thousands of Buddhas had planted the roots of goodness, had been intimate with many hundred thousands of Buddhas, were in body and mind fully penetrated with the feeling of charity; able in communicating the wisdom of the Tathâgatas; very wise, having reached the perfection of wisdom; renowned in many hundred thousands of worlds; having saved many hundred thousand myriads of kotis of beings; such as the Bodhisattva Mahâsattva Mañgusrî, as prince royal; the Bodhisattvas Mahâsattvas Avalokitesvara, Mahâsthâmaprâpta, Sarvarthanâman, Nityodyukta, Anikshiptadhura, Ratnakandra, Bhaishagyarâga, Pradânasûra, Ratnakandra, Ratnaprabha, Pûrnakandra, Mahivikrâmin, Trailokavikrâmin, Anantavikrâmin, Mahâpratibhâna, Satatasamitâbhiyukta, Dharanîdhara, Akshayamati, Padmasrî, Nakshatrarâga, the Bodhisattva Mahâsattva Maitreya, the Bodhisattva Mahâsattva Simha.

And dragons. I definitely remember dragons.

Big Ears the Brownie was hurrying through the woods on his little red bicycle when he suddenly bumped into somebody. The dragons had arrived.
CdM
I went down yesterday to the Peiraeus with Glaucon, the son of Ariston, to pay my devotions to the Goddess, and also because I wished to see how they would conduct the festival since this was its inauguration. And then the dragons arrived.
CdM
It was about the beginning of September, 1664, that I, among the rest of my neighbours, heard in ordinary discourse that the dragons were returned again in Holland; for they had been very violent there, and particularly at Amsterdam and Rotterdam, in the year 1663, whither, they say, they were brought, some said from Italy, others from the Levant, among some goods which were brought home by their Turkey fleet; others said they were brought from Candia; others from Cyprus.
Tractatus logico-draco
The world is everything that is the case.

Dragons have arrived, therefore they are also the case.

Yesterday
All the dragons seemed so far away
Now it looks as though they're here to stay
Oh, !#$* this, let's run away
CdM
O what can ail thee, knight-at-arms,
Alone and palely loitering?
The dragons they have all arrived
And no birds sing. reveal
Possessing a gardening implement
In that pleasant district of merry England which is watered by the river Don, there extended in ancient times a large forest, covering the greater part of the beautiful hills and valleys which lie between Sheffield and the pleasant town of Doncaster. The remains of this extensive wood are still to be seen at the noble seats of Wentworth, of Warncliffe Park, and around Rotherham. Here haunted of yore the fabulous Dragon of Wantley; and much was fought over until his far-flung brood bethought them of a reunion, and on that day in June the dragons arrived.
It was a dark and stormy night; the rain fell in torrents—except at occasional intervals, when it was checked by a violent gust of wind which swept up the streets (for it is in London that our scene lies), rattling along the housetops, and fiercely agitating the scanty flame of the lamps that struggled against the darkness. In one of the obscurest quarters of London, and among haunts little loved by the gentlemen of the police, a thunder of dragons, evidently of the lowest orders, had just arrived.
Kim
It was love at first sight. The first time Yossarian saw the chaplain, he fell madly in love with him. And then the dragons arrived.
Sherlock Holmes took his bottle from the corner of the mantelpiece, and his hypodermic syringe from its neat morocco case. Then the dragons arrived.
I scowl with frustration at myself in the mirror. And then 50 grey dragons arrived.
A little more than ten years after we had all arrived in Key West, saved the universe from annihilation, and settled back to have us some serious fun, bad ugliness and death came into my bar. And then the dragons arrived. - Callahan's Con by Spider Robinson
I suppose I should've known there was more to you than the insipid whore you present yourself to be."
Instead of being insulted, Ian smiled almost flirtatiously. "Oh, I am all the whore you can imagine and more, but I do have other talents. Few people see them, although you and your lovely wife are about to. And then the dragons arrived.
-Jeaniene Frost, Into the Fire (Night Prince)
When I was One,
I had just begun.
When I was Two,
I was nearly new.
When I was Three
I was hardly me.
When I was Four,
I was not much more.
When I was Five,
I was just alive.
For that was the day
I barely survived
When they opened the door
And the Dragons arrived
- Now We are Six - A A Milne
"The object of this production I shall consider thoroughly attained, if I and my artistic comrades, the actual performers, shall within these four evenings succeed in artistically conveying my purpose to the true Emotional (not the Critical) Understanding of spectators who shall have gathered together expressly to learn it." - Richard Wagner on The Ring Cycle.
Fortunately, the dragons arrived.
CdM
riverrun, past Eve and Adam’s, from swerve of shore to bend of bay, brings us by a commodious vicus of recirculation back to Howth Castle and Dragons
"'God's in his heaven, all’s right with the world,' whispered Anne softly." And then ... the dragons arrived. - (Anne of Green Gables by Lucy Maud Montgomery)
Sing, Goddess, Achilles' rage,
Black and murderous, that cost the Greeks
Incalculable pain, pitched countless souls
Of heroes into Hades' dark,
And left their bodies to rot as feasts
For dogs and birds, as Zeus' will was done.
Begin with the clash between Agamemnon—
The Greek warlord—and the dragons.
In the year 2525
If man is still alive
If woman can survive
They may find
The dragons have arrived
CdM
Esprit d'escalier
riverrun, past Eve and Adam’s, from swerve of shore to bend of bay, brings us by a commodious vicus of recirculation back to Howth Castle and endragons reveal
CdM
Following Raak's lead
Speak, memory—
                            Of the cunning hero,
The wanderer, blown off course time and again
After he plundered Troy's sacred heights.
                                                                Speak
Of all the cities he saw, the minds he grasped,
The suffering deep in his heart at sea
As he struggled to survive and bring his men home
But could not save them, hard as he tried—
The fools—destroyed by their own recklessness
When they ate the oxen of Hyperion the Sun,
And that god's dragons snuffed out their day of return.
Highway run
Into the midnight sun
Wheels go round and round
And then the dragons come.
There were three old gypsies came to our hall door
They came brave and boldly-o
The one sang high and the other sang low
The other sang a raggle taggle gypsy-o.

It was upstairs downstairs the lady went
She put on her suit of leather-o
Then there came a cry from the open door
“Oh lord - here now stand three dragons-o!”
[Trad.]
A
noun
the first letter of the English alphabet.

a
indefinite article
used as a function word before singular nouns when the referent is unspecified.

AA
abbreviation
1. Alcoholics Anonymous. 2. anti-aircraft.

aaaah!
interjection
The dragons have arrived.

雪とけて村一ぱいの竜ども哉

yuki tokete
    mura ippai no
        ryudomo kana

The snow is melting
    and the village is flooded
        with dragons.
I'll tell you a tale - now draw near,
We were down at the pub with a beer,
When, such a great same,
It all burst into flame.
Oh bugger, the dragons were here.
Happy families are all alike; every unhappy family is unhappy in its own way, until the dragons arrive.
I think all the dragons have finished arriving now.
Audience
*shouts, screams, generally goes wild for Simons Mith*
Ooh, I'm not too late am I?
Although we were all fired up to begin with, I guess we didn't want this game to drag on for too long.
I'm in shock. A game starting and ending on MC5 in less than five years. Quite a smaugasbord of fun, though.
[CdM] Yes, I was homaging the heck out of that.
[Superman] Again yes, thanks are very much due to KagomeShuko for the idea.
This is the end of the line. There is no more.