It was like this.

ykcowrebbaJ

sevot yhtils eht dna ,gillirb sawT’
ebaw eht ni elbmig dna eryg diD
,sevogorob eht erew ysmim llA
.ebargtuo shtar emom eht dnA

She puzzled over this for some time, but at last a bright thought struck her. ‘Why, it’s a Looking-glass book, of course! And if I hold it up to a glass, the words will all go the right way again.’

This was the poem that Alice read.

Jabberwocky

’Twas brillig, and the slithy toves

Did gyre and gimble in the wabe;

All mimsy were the borogoves,

And the mome raths outgrabe.

‘Beware the Jabberwock, my son!

The jaws that bite, the claws that catch!

Beware the Jubjub bird, and shun

The frumious Bandersnatch!’

He took his vorpal sword in hand:

Long time the manxome foe he sought —

So rested he by the Tumtum tree,

And stood awhile in thought.

And as in uffish thought he stood,

The Jabberwock, with eyes of flame,

Came whiffling through the tulgey wood,

And burbled as it came!

One, two! One, two! And through and through

The vorpal blade went snicker-snack!

He left it dead, and with its head

He went galumphing back.

‘And has thou slain the Jabberwock?

Come to my arms, my beamish boy!

O frabjous day! Callooh! Callay!’

He chortled in his joy.

’Twas brillig, and the slithy toves

Did gyre and gimble in the wabe;

All mimsy were the borogoves,

And the mome raths outgrabe.

‘It seems very pretty,’ she said when she had finished it, ‘but it’s rather hard to understand!’ (You see she didn’t like to confess, ever to herself, that she couldn’t make it out at all.) ‘Somehow it seems to fill my head with ideas — only I don’t exactly know what they are! However, somebody killed something : that’s clear, at any rate —’

‘But oh!’ thought Alice, suddenly jumping up, ‘if I don’t make haste I shall have to go back through the Looking-glass, before I’ ve seen what the rest of the house is like! Let’s have a look at the garden first!’