There's a short story by Richard Cowper that compresses an amazing amount of world-building into "He reached up to the buttons in his forehead, and changed his mind with an audible click".
Honourable mention to John Scalzi's "Shadow War of the Night Dragons", the opening sentence of which is a ~250 word masterpiece of deliberate urple. (As is the second; the third caps the joke with an eight word punchline.)