Who really said it
From the moment I picked up your book until I put it down, I was convulsed with laughter. Some day I intend reading it
Groucho really wrote this — not as a stage ad-lib but as a paid-in-wit book blurb, printed in 1929 on the rear panel of the dust jacket of Dawn Ginsbergh’s Revenge, the first book by his future screenwriter S. J. Perelman. Quote Investigator ↗ traced it to the jacket itself and to a newspaper printing dated 7 October 1929, and the wording above is the 1929 wording.
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