* FirstInstallmentWins: This book has sold 87 million copies, has been translated into 44 languages, and has never been out of print. The sequels weren't so lucky.
* BadassDecay: In ''She'', Ayesha is an outright tyrannical [[MurderTheHypotenuse hypotenuse-murdering]] villain (though [[EvilIsSexy very attractive with it]]). Over the course of subsequent books she is softened, excuses are supplied for her excesses, and she turns out to be Leo Vincey's true soulmate.
* HilariousInHindsight: Two travelers are captured by a mysterious, insular group of "foreigners with ways different than our own." The foreigners take the travelers to their bizarre leader, an EeriePaleSkinnedBrunette with extensive biological expertise, control over life and death, and uncanny powers of seduction. Despite the indiscriminate use of seduction as a means of control, this leader ''is'' in love with one specific man, who was previously a dead puppet but has recently come to life. The leader becomes violently protective of this lover, even going so far as to MurderTheHypotenuse and to force the man into eternal love-servitude. Fortunately, the leader dies during a strange ritual gone awry, and the travelers escape. Nowadays, it's hard to describe that plot without picturing [[Film/TheRockyHorrorPictureShow Tim Curry in drag]].
* ValuesDissonance: A good look at the main trope page will give you plenty.