I found this at Cipriano's blog , crediting Dorothy W., who credits Dr. Crazy who credits Anastasia, but the blog link is broken there and I couldn't continue the meme's trail.
1. Grab the nearest book.
I had to modify this a bit, because the nearest book was Machines at Work by Byron Barton, a board book which my 4-year-old checked out from the library recently. It has only 31 pages. So, I cast further afield, and the next nearest book is one my husband is reading off my bookshelf, something I'd acquired pre-matrimony.
2. Open the book to page 123.
Ok. Easy enough.
3. Find the fifth sentence.
Yah. Here 'tis: "You just keep slinging the same bullshit! shouted the SUBbie, and slammed back into his seat."
4. Post the text of the next four sentences on your blog along with these instructions.
"Casimir Radon listened to these exchanges with consuming interest. This was what he had dreamed of finding at college: small lectures on pure ideas from the president of the university, with discussion afterward. That the SUBbies had disrupted it with a pie-throwing made him sick; he had stared at them through a haze of anger for the last part of the meeting. Had he been sitting by the side door he would have tripped the bastard."
5. Don't you dare dig for that "cool" or "intellectual" book in your closet! I know you were thinking about it! Just pick up whatever is closest.
Uh, see the example; I clearly didn't.
6. Blog visitors should guess the book referenced. Good luck!
Photo credit: Jay Queue at Flicker. I have a personal connection to the building displayed in the photo, and it also concerns the book I reference. For clues, click the link to his photostream.