You've done loads of research and footwork in order to make sure your ears are as clean as possible so that you're not missing any detail in your rig.
You take notes on how two different speaker cables sound because you don't trust your audio memory alone.
You set your rig up and then had interconnects made in the shortest lengths possible. Of course no cables touch each other or the ground.
You've thought about unplugging everything in your home before a listening session, except your stereo, in order to have the cleanest power possible.
Your rig sounds better at night, and you realized this before anyone told you. Upon finding this out, you wake up in the middle of the night to see how it sounds at 3 a.m.
You start buying stereo equipment for friends and family not because you think they will enjoy it, but because when you are with them, at least you'll have something decent to listen to.
You have speakers in your car where the dead pedal is and your foot goes numb because there is no comfortable place to put it.
You've bought a pair of speakers again that you already owned and sold because you think they might sound better with your new front end, and they do!
You've moved your speakers a quarter of an inch here and an eighth of an inch there so many times that the carpet has hundreds of holes in it.
You've taken into consideration the sonic properties of your listening chair.
When showing off your system, you try to stand in the room where your body might act as a bass trap.
