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From the Hitchhiker's Guide to the Galaxy:

Poetry, well written, can be a spiritually uplifting experience. Badly written, it can be an experience of buttock-clenching horror.

The third worst poetry in the universe is written by Vogons, and frequently used as a form of torture.

The absolute worst poetry was written by Paula Nancy Millstone Jennings. It involved decaying swans. Luckily, it was destroyed during the demolition of the Earth.

Examples of good, if long, poetry can be heard on the planet of Golgafrincham, home to the great circling poets of Arium.