Writing tip: Write the unexpected in an expectable way

When a magician pulls a rabbit out of a hat, the audience says it's magic, but when a writer does it, the audience asks where it came from. Anyone can write something that was unexpected. What makes the unexpected brilliant is that the audience could have expected it, if only they'd been paying more attention to what went into the hat.

Prepare the audience for every shock; uncover a few bones before you dig up the corpse; and foreshadow extensively, without being predictable. It'll make you seem smarter than you are, which is better than being smarter than you seem.