When you dream and dream about a particular knife, you get it, and then dream and dream about some other knife afterwards.
When you look at a map of the U.S. and the world and find yourself looking for the places where knives are manufactured.
When every time you go into a hardware or outdoor store you must check to see if and what type knives they sell.
When you're really happy to spot a knife you own in a movie.
When walking in a public place, you secretly think of yourself as "this person who is carrying a Spyderco Endura" (or Chris Reeve Sebenza, or Benchmade Axis, or whatever).
When you find yourself in public checking other people's front pockets for knife clips.
When you collect knife catalogs because they make "good reading."
When you HAVE to got on BF every single day. (BTW, if you're like me, at Y2K to the 2nd or so, DON'T!!!)
When you spend more time worrying what clothes go with your knife instead of the other way around.
Jim