Man I wish I could enjoy Wheaton's narration style but after trying to listen to John Scalzi's The Collapsing Empire and hearing every single character given the same tone deaf voice (literally tone deaf: not like saying racist things but rather had the same sarcastic and smug tone of voice for everyone irrespective of character descriptions or even explicit tones given like "she said morosely") I refuse to buy another book he has narrated.

Amber Benson it is then.

What books are those? Sounded like murdebot diaries until the end.

Book version no?

Yeah this would work quite well before the internet became popular.

Last February, Undertale creator Toby Fox sent newsletters by e-mail with 3 random banners of Deltarune characters saying something, with various degrees of rarity. They were all collected within 2 days, including one that only appeared 1 out of 1.000.000 times. However, it should be noted that the Deltarune community is fucking crazy (in a good sense).

It would depend on how rare the rarest endings are. If there are only a handful of copies of one of the endings and the handful of people that got it don't engage with the online fan community (not everyone who reads books are online about it), those people might not even know there are different endings, let alone that they have a rare one.

That's why they gotta be a famous author first.

Books of course do get read. It happens sometimes.

OP generously assumes

Yes, OP used the word 'If'.

And that a book written in such a way to support 10 different endings would be good enough to support online arguments.

You sometimes get this in movies as well where the take that they use in the trailer is different from the take that's in the actual film. Usually it's the same words but with slightly different inflections. It's close enough to always make you wonder.

Pacific Rim is a classic example. The rousing speech in the trailer is so much better than the one in the film.

Self publish, provide ocr-free pdfs (i.e. images where you can't highlight the text) no epub or mobi because if you can extract the text, it would be easy to diff the text. And there are tools to ocr un ocr'd pdfs with varying degrees of error....maybe take up book binding and mail print bound books with beautiful artwork no one would want to deface....how much work you want to put into this joke?

And then keep the 13th in a bank box, and the 14th world shattering ending is kept in one of the 10 boxes of misc note paper in your attic.

And your last words will be: "There is another ending"

I think there were 3 endings that varied by region, but in the pre-internet times this did very little to effect discussion.

Also, the VHS release included all the endings.