To be clear, it could be anything small or big you choose to do/be because you can for whatever reason.? So you got any?

I myself have some, I've often in the past (and still some now even) would choose to wear my shirt inside so when people tell me my shirts inside out, I would just say "I know" and carry on. I also say the word "bacon" a lot often and almost never referring to the food. I'm usually using it as a mean-nothing word to say in reply to anything (if it ever has a meaning when I say it, it usually is relayed by tone of voice and context).

I've trained myself to not blink as often.

Staring contests used to be the big kid stuff around here. These days, I'll just intentionally stare at someone without a facial expression until they move. 

paper luigi : My friend does that from time to time and it always creeps me out

I like to flip my hair from time to time because a lot of people get annoyed by it and it's a fun way to taunt someone.

I had a quirk in the past for caps. Don't know why, but I loved wearing them, even when at home. Sweet thing I got rid of that with all the swag stuff going on nowadays.

My only quirk nowadays would be putting my sunglasses at any given time. Probably because my contacts make me very sensitive to light, but I must admit I like to wear them whenever I can, even in the underground (artificial light can hurt as much as sunlight). Plus, they are brown in color, not black, so I don't lose that much vision while wearing them.

And, well, maybe cracking my fingers could be noted here too, but I don't see it as a quirk. I sometimes feel my fingers "not right", so I crack them and everything goes back to normal. For example, like I'm doing right now

Well I wear baggy clothes and stuff, and still do till this day because to keep my body warm. Plus I am a tomboy. and...the pretty, cute and elegant cloths I would wear is the styles from Japan I dunno how that happened. Maybe because I watched a lot of animes in the past lol to just unconsciously do it without knowing it. I started to notice this a few years ago. I was like uh...so my styles a from japan...the accessories I have is like from Japan...I love it considering I always wanted to wear their type of styles and clothing as well. Its the only thing that fits my body shape in a way.

I have a quirk for band shirts i love wearing them. I have no idea why though, it is cool when people walk by and say "I like your awesome (insert band name) shirt", discuss fav bands of the genre and hear some tell me my music is satanic

paper luigi : Thats... both creepy and awesome.

I've gotten pretty good at manipulating my eyes. I can roll them back completely and keep a straight face (creeps my mother out to no end lol) and only move one eye at a time. Yes, thats possible. No, I won't explain how. However, I will say it's dead-arse easy to do once you can cross your eyes for more than ten seconds without them hurting/watering. I've also figured out how to wiggle my ears. Needless to say, I can easily break someones composure if thier trying to be seriours and looking at me.

I do not know if it counts, but during The summer I usually wear no tshirt unless I have to go out. I do it mostly because it get scorchingly hot where I live (especially upstairs), and wearing one would transform it into a wet cloth. I also do it when I walk around a fairly large city. I guess there *might* be some vanity reasons to go it but it is not The main one.

I often do a quick bobbing my head up and down when I'm putting emphasis on something while I'm talking. I don't really care how ridiculous I look when I'm doing that and most of the time, no one else does either XD

However, there was one time where I did that when I was emphasizing the word no, and one of my friends made fun of me for nodding my head yes while saying no! That's the only case where I care whether or not I do that. It's become a habit that I barely ever realize. I'm hoping that I won't do that when I'm performing my 4-minute long speech in front of the class for English next week

          I wear all black, always, all the time.  I am currently 40 years old and began this when I was 12.  So for the last 28 years I have worn only black, not another color ever.  Some of my clothes ( a very few) may have small bits of other color, mostly blue
or red, but by and large my clothes are solid black.

     I originally started this because I really liked the way it looked and thought it would be cool (I was 12 after all).  Then, later, I
  kept it up because at the time it really seemed to make people very uncomfortable ( it wasn't as common as it is now and at the
  time I was the only person at my school doing it).  As I became older and an adult I had grown so accustomed to it that I just
  kept doing it.  Now I feel very uncomfortable trying to wear any other color and would probably really freak out anyone who
  knows me if I wore some other color.

    Does this count as a quirk? Also, does anyone find it odd that I still keep it up?  I've always wondered what someone who didn't
  know me thought of it.

                                                                                                                    -Ronnie

I have... Quite a few. I'll just mention some. XD

   I say, "Oosh-a boosh." When I get up from laying down or sitting down. No idea why. I don't know when I started it, I don't know why I started it, to the point where I don't notice me doing it, it just happens automatically. I mean, at this point it's less of a quirk, and more of a mannerism. XD

   I also love embarrassing my parents in public. It's the best. Sometimes if we're at a mall or the park, and there are a lot of people around, I'll just yell, "I love you poppa!" And start giving my Dad the most awkward and embarrassing hug I can think of. Like arms flailing, wrapping around his head, weird stuff. I've licked his head once. XD  Seems like a weird thing to admit, but Internet. XD

   Also, I'm weird.