"Tomino's Hell" (トミノの地獄) was written by Saijō Yaso (西條八十) for his 27th collection of poems 'Sakin' (or, 'Gold Dust' in English) in 1919. There is a Japanese legend surrounding it which states it should only be read with the mind, and never out loud. It's uncertain how this rumor started, but it goes on to say that "tragic things (凶事) will happen" if you do.
The story used to be very popular on 2ch. Many users said that nothing happened after reading it and uploaded pictures and videos as proof, but there were also posts where the user did not come back to post any results.
If you were to read this out loud, it'd be better to do so in Japanese. An alternative, more accurate translation by David Bowles can be found here.
Poem
トミノの地獄
Tomino no Jigoku (Tomino's Hell)
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西條八十
Saijo Yaso
詩集「砂金」より
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姉は血を吐く、妹（いもと）は火吐く、
ane wa chi wo haku, imoto wa hibaku,
His older sister vomited blood, his younger sister vomited fire,
可愛いトミノは 宝玉（たま）を吐く。
kawaii tomino wa tama wo haku
And the cute Tomino vomited glass beads.
ひとり地獄に落ちゆくトミノ、
hitori jigoku ni ochiyuku tomino,
Tomino fell into Hell alone,
地獄くらやみ花も無き。
jigoku kurayami hana mo naki.
Hell is wrapped in darkness and even the flowers don't bloom.
鞭で叩くはトミノの姉か、
muchi de tataku wa tomino no ane ka,
Is the person with the whip Tomino's older sister,
鞭の朱総（しゅぶさ）が 気にかかる。
muchi no shubusa ga ki ni kakaru.
I wonder whose blood is on it?
叩けや叩きやれ叩かずとても、
tatakeya tatakiyare tatakazu totemo,
Hit, hit, without hitting,
無間地獄はひとつみち。
mugen jigoku wa hitotsu michi.
Infinite Hell's one road.
暗い地獄へ案内（あない）をたのむ、
kurai jigoku e anai wo tanomu,
Would you lead him to the dark Hell,
金の羊に、鶯に。
kane no hitsuji ni, uguisu ni.
To the sheep of gold, to the bush warbler.
皮の嚢（ふくろ）にやいくらほど入れよ、
kawa no fukuro niya ikura hodo ireyo,
Fit as much as you can into the leather sack,
無間地獄の旅支度。
mugen jigoku no tabijitaku.
For the preparation of the journey in the familiar Hell.
春が 来て候（そろ）林に谿（たに）に、
haru ga kite soro hayashi ni tani ni,
Spring is coming even in the forest and the stream,
暗い地獄谷七曲り。
kurai jigoku tani nana magari.
Even in the seven valley streams of the dark Hell.
籠にや鶯、車にや羊、
kago niya uguisu, kuruma niya hitsuji,
The bush warbler in the birdcage, the sheep in the wagon,
可愛いトミノの眼にや涙。
kawaii tomino no me niya namida.
Tears in the eyes of cute Tomino.
啼けよ、鶯、林の雨に
nakeyo, uguisu, hayashi no ame ni
Cry, bush warbler, toward the raining forest
妹恋しと 声かぎり。
imouto koishi to koe kagiri.
He shouts that he misses his little sister.
啼けば反響（こだま）が地獄にひびき、
nakeba kodama ga jigoku ni hibiki,
The crying echo reverberates throughout Hell,
狐牡丹の花がさく。
kitsune botan no hana ga saku.
The fox penoy blooms.
地獄七山七谿めぐる、
jigoku nanayama nanatani meguru,
Circling around Hell's seven mountains and seven streams,
可愛いトミノのひとり旅。
kawaii tomino no hitoritabi.
The lonely journey of cute Tomino.
地獄ござらばもて 来てたもれ、
jigoku gozaraba mote kite tamore,
If they're in Hell bring them to me,
針の御山（おやま）の留針（とめはり）を。
hari no oyama no tomehari wo.
The needle of the graves.
赤い留針だてにはささぬ、
akai tomehari date ni wa sasanu,
I won't pierce with the red needle,
可愛いトミノのめじるしに。
kawaii tomino no mejirushini.
In the milestones of little Tomino.
Image Origin
(click for expanded view)
The image associated with this story is a cropped version of a painting by Yuko Tatsushima (立島 夕子) entitled "I Can No Longer Be a Bride".
It was supposedly made after the artist became a victim of sexual assault.
The title refers to how, according to Japanese tradition, women who are raped often have ensuing difficulties with marriage and reputation due to the perception of them having lost their innocence.
Yuko's official Japanese website can be found here.
Credited to Saijō Yaso
Originally uploaded on July 23rd, 2012