OK, this one works like this. The further down each chain you go... The more addicted you are. It was written to be on topic but I'm a nerd and had to take it too far.

have fun.
You get your Fremmy name tattooed on your chest. And think it makes you more of a man.
...You burst into tears when your wife/gf changes your Fremmy name. :O
......You get the new name tattooed on your back.
You imagine a whole world incorporating rl and rs mixed in some crazy way.
...You write a fan fiction about it.
.......It's so well thought out it actually makes sense.
You go to a tropical paradise for a week as a vacation from RS.
...You call it Karamaja your entire stay.
......You get disappointed when there are no monkeys or pirates your ENTIRE stay.
.........You try to pick bananas to pay for your flight back home because you forgot to bring a ticket. (for those of us older accounts)
............You just HAD to see if the local bar hat a bronze axe lying laying on the table.
You've written out schematics to build a dwarf-minicannon
...You built it.
......It works.
You asked your neighbor Gertrude for a cat. <3
...you've lost one or more cats by putting them down outside and expecting them to follow you.
......You keep a toy mouse and a bucket of milk with you at all times.
.........You chose your cat to match the color pattern of your first RS cat.
You know every city in Runescape
...You can accurately spell each city name without thinking about it.
......You can draw out directions to and from anywhere in Runescape
.........You can draw out a detailed map of Runescape
............You HAVE drawn out a detailed map of Runescape.
You have at least one full notebook of experiment logs from Runescape testing.
...They are written in Klingon so nobody else can benefit from your hard work. (without working for it)
......Instead of a notebook, it's random papers tossed around your computer because you are too busy playing Runescape to organize them.