... I don't even know what this is

I've seen some really WTF book covers (1970s sci-fi is especially prone to it), and quite a few that seemed to have only the most passing relationship to the book's contents, but I am pretty sure this VERY NOT WORK-SAFE cover of The Princess Bride is the most bizarre, hilarious mismatch of book contents to book cover that I have ever seen.

If I need brain-bleach, so do you!

Not worksafe! Quite porny, in fact! Did I mention this is an actual cover? Of the actual book? Someone was clearly dropping a lot of acid at Ballantine Books in the 1970s. Either that, or my edition of The Princess Bride somehow left out the tentacle rape, skulls, snakes and inappropriate religious imagery. Also I never really imagined Buttercup looking that much like Cher.