Everything has to be symmetrical/neat, it really annoys me when something isn't,for instance if I'm queueing to buy something at a shop and there's some leaflets, and they're not all perfectly straight behind each other, so you can see the corner of one behind or something like I have to make them straight, otherwise it bugs me all day lol. And it's the same if there's two things on my desk that are roughly the same size, if their on opposite sides of the desk, then they have to be parallel to each other, and if theirs a small sheet or something under a big sheet, then I have to take the small one out from underneath it, and put the bigger piece on the bottom, otherwise I feel like I could be missing an important piece of work, so I have to have them like that so that I can see all my work at once, if you look at my desk theirs like pyramid stacks of paper and stuff.
Also with my guitar, all the leads I use have to be wound back up after use, the Guitar has to be straight when it's hanging off the wall (Thats more for the sake that I don't want to put too much strain on one side of the hanger, incase it falls off :L) And for all the effect pedels I use I made a rig out of a few pieces of wood so that they all stay together and aren't scattered about everywhere, and like the paper thing, they go in order of size.
Weirdly though I don't care what state my Garage is in, there's bikes, tools, pieces of bike, break cables, and all sorts everywhere and it really doesn't bother me that it doesn't have a proper place, it's weird :L