I have two things that I keep in my bug-out rucksack at all times - a small stack of those miniature puzzle books that you get at the supermarket checkout, rubber banded together and with a lottery pencil stuck inside. I've got crossword puzzles, word finds, cryptograms, general trivia, all kinds of stuff.

The second thing that I've got is a Game Boy Advance Micro I purchased at a garage sale. It's tiny (about as big as a credit card, maybe 3/4 thick as a pack of cigarettes), and it's got one of my favorite games (River City Ransom) in there. I figure that if a crisis lasted longer than a single set of batteries, it's a really big deal.

EDIT: Though it seems nice, I wouldn't have liquor in my BOB, as I abstain from alcohol...