This is far and away the most unfortunate, longest-brewing, disappointing typographical error that I know. I’ve seen typos in headlines. I’ve seen typos in books. I’ve seen typos that caused confusion or absurd mental images. But a book title!
Get Off the Unicorn contains fourteen short stories of science fiction and fantasy by Anne McCaffrey. Years after the fact, the author confided that the title she’d chosen and sent to the publisher was Get of the Unicorn.