What&#39;s the Most Important Thing You Take on an Airplane to Stave Off Boredom?S

You're in a small seat, you can't move much, and there really isn't anything to do. Airplanes were just not designed to be fun. That doesn't mean you can't bring something along to make the ride better. What's the most important thing you take on a plane to stave off boredom?

I'm writing this on a plane at the moment and am not bored, despite the photo, but I see a lot of bored people. Some are using technology, others are not. Some have managed to fall asleep, and others are kept awake by other passengers. So what's the best thing to keep you occupied? Despite my general dislike of the iPad, it's my favorite thing to take on the plane (and basically the only time I really love it). For others it seems to be sleeping medication or a good book. What's yours?
