Know you not of the rhythms of poetry?
There was a young man from Japan
Whose limericks never would scan.
When asked why this was,
He replied "It's because
I always try to fit as many syllables into the last line as ever possibly I can"
Beck's picking up the pace. I think he is trying to show the narrator's increasing madness by speeding up the poem as it goes along. But the first couple stanzas were ..... very Shat....nereque.