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In page The Meaning of Liff:

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The title of the book was chosen to be very similar to Monty Python's film The Meaning of Life that was being produced at the same time, after Douglas Adams called Terry Jones to ask if it would be OK. Adams's idea was that the potential confusion with the film's script would help to sell more copies of the book.[5][citation needed] In fact, in the beginning of the Monty Python film, the gravestone with the title "The Meaning of Liff" appears before a lightning bolt strikes the last F and converts it to an E.