You keep a book underneath your car seat in case you encounter heavy traffic
You see someone reading a book and you hurt your neck trying to catch a glimpse of the title.
You feel like a stalker when doing the above.
After seeing a movie based on a book you leave telling anyone that will listen everything what was wrong or left out.
After finishing a book you wish they did a movie of it only to realize that it wont be as good as it is in your head.
You get really pissed-off when the book store closes because of a national observance/holiday, or it will take an Amazon/B&N shipment an extra day to arrive because those stupid mail carriers need a day off.
What are some of yours?