That's from SR-71 Revealed: The Inside Story by Richard H. Graham, Col. USAF (Ret.)
From eryn_, who got it from a bunch of people, and I've seen in before too...
- Grab the nearest book.
- Open the book to page 123.
- Find the fifth sentence.
- Post the text of the sentence in your journal along with these instructions.
- Don't search around and look for the "coolest" book you can find. Do what's actually next to you.