I only use the lightswitch in the bathroom that doesn't turn on the fan because I hate the fan noise.
I always open a closed shower curtain when I go into a bathroom.
I can only have volumes on even numbers or 5's because I need symmetry.
I always correct misspelled words, even if it makes someone angry with me.
I make sure my Mac's dock is coordinated by color. Blue icons are together, red icons together, blue icons, and so on.
My iPhone will never have an unfilled row of app icons. Each row must have four for symmetry.
I develop bouts of insomnia when annoying, repetitive noises occur when I'm trying to sleep. Currently, the fridge in the hotel I'm living in won't quit making this ridiculous (yet faint) sputtering noise, so I either cover my head with several pillows to drown it out or I won't sleep.
I organize the food on my plate so that it doesn't touch, and I turn the plate so the portion of the meal I'm eating is directly in front of me.
When eating a sandwich with a side dish, I make sure to eat all but one bite of the sandwich, then eat all of the side dish, then finish the last bite of the sandwich.
If I'm eating just a sandwich, I always throw away the very last bite.
If I'm drinking a bottled drink, I always pour out the very last drink in it.
If I'm eating a sweet (donut, cookies, etc) and I have assigned myself an amount of milk to drink with it (glassful, bottle, etc) I ration out the amount of the sweet I will eat between each drink of milk so there is exactly one gulp of milk left when I am finished with the sweet. Using 15 cookies as an example: 3 cookies, drink milk, 3 cookies, drink milk, 3 cookies, drink milk, 3 cookies, drink milk, 3 cookies, finish milk.
I almost always have to eat the same meal when watching a movie as with the first time I watched the movie. For example: I have to eat Kraft Deluxe Sharp Cheddar macaroni & cheese when watching Step-Brothers because that is the only thing that feels right to eat while watching it.
I like to set an alarm for 2 hours before I have to get up because I like knowing that I have 2 more hours to sleep.
I usually delete and retype posts I have made an error in because I can't leave an error and I hate the notice that shows I edited the post to correct an error.
I take my wedding ring off, flip it, and put it back on a lot.
I always check myself out in reflective surfaces because I am narcissistic, but I also always come up with a fake reason for doing so in the off-chance someone asks me why I was looking at myself.
If I commit a traffic violation or piss someone off when driving, I always develop a fake excuse in my head for doing so in the off-chance I get to explain why I did what I did.
Pokemon related:
I always organize my Pokemon boxes by type. If a Pokemon is dual-typed, I put it in the box I think it fits best (but fossil Pokemon always end up in the Rock box).
All of my Pokemon know moves according to my standard: if monotype, it will have 1 STAB attack, 1 Normal type attack, 1 coverage attack, and 1 status move. If dual typed, 1 STAB attack of each type, 1 coverage attack, and 1 status move. The only exceptions lie with Pokemon that have very specific abilities that could affect that and my E4 Sweeper Mewtwo.
If I am traded a Pokemon with a nickname I don't like, I will breed the Pokemon, train the offspring, and teach it the attacks of the horribly nicknamed parent. Then I Wonder Trade the parent.
I refuse to replace a Pokemon's signature move. For example, I use my level 100 Mewtwo as my E4 sweeper, but I refuse to teach anything worthwhile over Psystrike, even though it serves little to no use against the Hoenn Elite Four.
I use certain attacks because I feel like some super effective match-ups are more super effective than others. For example, I always use Ice Beam instead of Shadow Ball against Drifblim strictly because I have this feeling in my head that Ice is stronger against Flying than Ghost is against itself.