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So, we all have at least one really odd thing about our physical selves, I'm sure. Why not share it? I think it could be pretty interesting.

Oh, I have plenty of these.
I have scoliosis, which is a sideways curvature of the spine. Likely related to this (probably because of bad posture as a child) I my hips are crooked, causing one leg to be probably something like an inch (as it's very difficult to measure) longer than the other.
It was while getting x-rays for this that it was discovered that there was a thin chip of bone missing from one of my femurs... Was "femur" the correct term for one of the foreleg bones? Eh, I don't remember what the cause was, but as I recall it doesn't effect the integrity of the bone.
Also, the dome portion of my skull is elevated slightly above the rest, though not so much that anyone would notice, unless I were to shave my head (or the observer were to give me a scalp massage).
In addition to all of these, I am also pigeon-chested. This means that my chest swells out, unusually. Of my many deformities, this one is most easily observed. It is also probably hand in hand with my heartbeat being visible through my chest and sometimes even shirt. When I was in gym-class as a kid (and thinner) after running, it would often shake my entire shirt. My heartbeat is also unusually fast.
I have terrible circulation in my hands. On a slightly cooler side of room temperature, I will lose feeling in my fingers and I have, through the shock of the cold, caused my wife to scream through light caress.
There are very strange veins that I've noticed on the bottom of my tongue that only appear to be connected at one end. Very strange.
The second toe on each of my foot is longer than the first... Or perhaps exactly as long. It's hard to tell, as the distance is very close, in either case. I'm not entirely certain just how uncommon that is.
I'm not sure how much of a quirk this is, but if you've seen Shamen King, you may notice that the Faust character (I can't remember what generation he was) mentioned that the dark circles under his eyes were permanent, from having not slept for a certain length of time. Turns out that's absolutely true.
The only thing off about my scars is that I have almost none at all and certainly none that you'd notice. It's not that I never got hurt at all as a kid, just never badly enough to scar and I always healed fairly well.
The only one that I can still faintly see is the one bad burn that I got from putting my hand on the side of a mower (foolishly not realizing that it was incredibly hot) in an attempt to save a toad. It resulted in a blister that looked something like a cross between a golf ball and a membranous, overstuffed pillow. I heard that draining it wasn't a good idea, but the swelling got to be damned painful, so I did, anyway. There is a slight difference in how my palms lie on a flat surface, so that may or may not be related, and there may be occasional discoloration, but I'm not able to observe any now and the rest might be psychosomatic.

I have a birthmark at the bottom of my foot, it's a little brown line. I have another one on my upper thigh it's white and splotchy though.
I have oodles of moles all over my body, they keep popping up.. they look pretty rad though.. and when I'm bored I can try to connect all the dots. ;D
I have a scar on my head from falling off a bed, one on my arm from my microwave, another one on the same arm from a hot basket touching me, and one on the bottom of my foot from stepping on a barnacle.
I have really bad circulation, my toes and fingers are always cold.

..that's all I can think of. XD

Hmm...

I suffer from excema all over my body, which has left me with quite a few scars up my legs, stomach, and chest.
I also bruise very easily, and often will wake up in the morning with a bruise somewhere from punching the wall or headboard of my bed.

I'm not really sure what else... I have good circulation, which is wierd, considering the fact that I have Insulin Resistance...

I twitch randomly and have a bunch of scars from scabs I scratched.

My left ankle pops repetively from a break in middle school.
Ive 3 small circular birthmarks on my inner thigh that create a perfect triangle if you connect them.
Ive a scar through my eyebrow so therea a tiny patch of hair missing.
Various cuts and minor scars from random accidents and my cat.
Below one of my ankles I look permenantly bruised from the same break I believe.
My 2nd toe on both feel is longerer than my big toe., and instead of curling my toes look like sticks with a blob of wax on the end.(Its funny cause when I put on socks the second toe curls slgihtly so my feet actually look like cat toes)
Ive a burn scar on my forarm where I 'hugged' a clothes iron getting laundry.
My teeth are slightly crooked on the bottom row, so one tooth is behind the others.
And not sure if this is 'weird' or not, but a friend confirmed this does happen, my eyes constantly grow and shrink, even in stable light. WE stood next to another friend and mine continued to change while the friends stayed the same.

Ah...so that's what it's called. Interesting.

Lets see, my left ankle pops when I rotate it, I am scarred on my hands from growing up with cats, I have a small scar across my right fore-arm near my wrist from a shotgun shooting accident, and I am far-sighted or near-sighted. Whichever is the one that means seeing at a distance is difficult.