Finnegans Wake is a work of fiction by the Irish author James Joyce, published in 1939.
Written almost exclusively in a 'make-believe' language, it is notoriously difficult to read, and has never been popular with the reading public.
An example of the writing in Finnegans Wake:
'... the humptyhillhead of humself prumptly sends us unquiring one well to the west in quest of his tumptytumtoes: and their upturnpikepointandplace is at the knock out in the park ...'
Full text (if you can face it!)