General population or me? If you’re talking about me, specifically, I’m an outlier. When I’m looking for a book I don’t look for a title or a cover that interest me (because those really have no bearing on whether a book will be good or not), I click into the link of every single book in the category I’m looking at, read the back blurb, any additional descriptive content, and then, if it sounds interesting, read reviews until I’ve found out all the plot and spoilers. If I still like what I see, I read the book.

I might read the blurb, descriptive content, and reviews of five hundred books before I find one I want to read (if I’m looking online, and I usually am). I do this every day because I read one to two books per day and it’s rare for me to have a backlog of books waiting to be read.

So…number of books with plot, spoilers, and endings I could remember well enough to describe, talk about in a general conversation, or perhaps recommend to someone based on their likes (with the caveat that I haven’t read it, of course)? Hundreds, at least. Thousands probably, given slight prompting, though I’m sure I would have lost at least some of the details, given I didn’t find the book interesting enough to read at the time.