My J word is Jabberwocky.  It's an adventurous word created by Lewis Carroll, whom I believe Dr. Seuss channeled years later.  If you've never read this poem, spend a minute on it now.  It will challenge your brain and tickle your imagination like no other poetry on the planet. 

JABBERWOCKY

Lewis Carroll

         (from Through the Looking-Glass and What Alice Found There, 1872)   
`Twas brillig, and the slithy toves
     Did gyre and gimble in the wabe:
   All mimsy were the borogoves,
  And the mome raths outgrabe.

http://mybroadband.co.za/vb/showthread.php/611518-Jabberwocky

"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,
  nd the mome raths outgrabe.    Cool, huh?  You have just read a classic.