When you purchase candy you don't eat, just for the container.
When you don't own a single pair of socks that aren't permanently stained from your hiking boots.
When you head out for a long hike and you be sure to grab your GPS, flashlight, gun, TP, cache papers, Pen, trade item, spare batteries, travelbug....but you forget water and insect repellant.
When you know the exact minute, no matter what time of year, that it is too dark to be caching in the forest.
When you take the family out for a hike and you have to pretend to act surprised when a nearby cache shows up on your GPS.
When your spend more in fuel for your car than you do on food.
When you've ever thought of caching during sex.