When the only food you eat is stuff that looks like flakes or worms.
When you talk to your fish...and they talk back!
When, instead of eating with your fam, you dine with your fish.
When you boycott eating fish and lead a protest in front of the seafood resteraunts about cruelty to animals.
When you get your paycheck or allowance, you count up how many fish/tanks/supplies you can get.
When you count down the days until you go to your lfs. When you go every day.
When you start inviting your friends over to your fish's funeral.
When you "wed" your fish.
When on your answering machine, you can hear all your filters running in the backround.
When you start wondering why your breath smells like fish food.
When you ship out your tv and comp. to make room for more tanks.
When you call your fish when your on vacation.
I can think of some more, but I have to make dinner, so I'll name more later.