Vegemite.

Thanks for the link. That does explain a lot. Off the top of my head, I can think of one example, an author's series that really annoyed me because the blurb on the back and the plot of the first book led me to expect something very different than what the series became in later books, so much so that I never read the last book. In fairness to the author, I wasn't misled - he later posted the outline of what he had intended to write, and it was in keeping with what I'd been led to expect, but editorial decisions and other things ended up shaping the story very differently. I actually really like other series and books of his that are of the same general style as what the series became, but since I wasn't expecting it, I was annoyed. It did teach me that in this particular author's case, I should break my rule about not going into a book with any expectations beyond what the story leads me to expect.

And as an aside, the one time I had Vegemite, I was told that people either love it or hate it, so my reaction was complete indifference. At some point, I should try it again without a setup that will trigger my contrarian nature.