Not sure if it's been mentioned before, but The Upside-down Sinners in Karazhan Crypt are a direct reference to the 1986 Kurt Russell film
Big Trouble in Little China. In the film, the hero and his sidekick swim through the Pool of The Upside-down Sinners. So while that room may be ultra creepy in WoW, it's a total ripoff of an ultra cheesy (and awesome) 80s flick.
Incidentally, Raiden, of Mortal Kombat fame, was inspired by The Three Storms in the same film.
Now you know.
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