I don’t think so… everyone in my family except me and my dad have straight forefingers. They touch all the way from the base through to the top of the fingernail.
True, I’m a guy with low bodyfat. Growing up and going to swim class, and going to pools with family and friends, I was the one guy that would leave everyone scratching their heads- what’s the problem- just float! Nope, sorry, can’t do it. When I got older I heard that something like 1%* of the population is just unable to float.
*Pulled this number out of my ass. I don’t know what the number actually is, but it’s low.
No one would describe me as someone with low body fat, but I can’t float, either. My problem is that my body fat is distributed almost entirely from the waist up, while my legs are very muscular. Any time I have tried to float, invariably my legs start sinking and they just pull me right under.
You guys are all mutant freaks! 
I don’t have anything nearly as interesting as some. I only have two wisdom teeth, which I never had to have pulled because I had two other teeth pulled as a kid (something about my braces) and the top wisdom teeth had space to move in to. The bottoms were just never there.
I can cross my pinkie toe over my next toe without touching. It’s a good strong cross-over; not some half-assed “laying on top of.” It’s just as pronounced as if you crossed your fingers.
If I sit on the floor with my legs bent and feet drawn up so they’re all the way up to my crotchal region, soles completely parallel and touching each other and knees spread out, my legs will lie completely flat with the knees touching the floor. I never thought this was unusual until I started noticing that most people’s knees end up about 3-5" above the floor.
And finally, I can make my left eye go way off to the side while the right one remains looking forward.
Wow, I think I just discovered 3 or 4 supernumerary nipples thanks to that wiki article. I had no idea, just assumed they were moles.
Ok, here’s the deal… I think I am a chimera.
No, really!
I was birthed with 2 placentas. We were supposed to be twins, I believe. Apparently, it was such an unusual occurrence of double placentas that they were documented by Doctor’s with pictures and study.
I have no ostensible way of proving that I am chimeric but I have always had this very strange “bio-kenning” of being incomplete in some way…or a strange sense of pervading duality…
On my right foot, all of my toe joints pop while I walk. My left foot is completely silent, but my right sounds like I’m stomping a rice-crispie bar with every step. Alas, I discovered early in life that my ninja career was hopeless, it is hard to stealthily stalk someone while hopping after them on one foot.
I can move both of my eyes indepenently from one another like a chamelion, but that’s just from trying really hard. It’ll give me a nasty headache after doing it for more than 10 seconds or so.
I have a patch of white arm hair for no apparent reason on my right wrist, and my facial hair grows so high up on my cheeks that when I shave I have to be careful of my lower eyelid.
Also put me down for being massively double jointed & having no arches in my feet.
Its pretty common. The problems come on x rays, because you should have 5 lumbar vertebral bodies, but you can have an extra one on the bottom (lumbarization of the sacrum) or you can have an extra thoracic vertebral body (that is, vestigial ribs on the top lumbar vertebral body, or else no ribs on the 12th thoracic vertebral body). Which is totally no big deal, until you get something wrong that needs to be fixed in your vertebrae, and nobody is sure which vertebral body is which. Hilarity, followed by surgery in the wrong spot, followed by more hilarity, followed by lawsuits then ensues.
Where I grew up (th’ 'Mercan South) that was referred to as a “witch nipple”, where a witch would suckle her familiar, or, depending on the local tradition, Satan.
Allow me to propose a new motto, based on this thread.
“The straight dope: you don’t have to be a mutant to post here, but the odds are pretty good you are anyway”.
The top curve of my right ear is fused to the main ear-acle; my left ear is normal.
I have a heart murmur/valve click that comes and goes.
Perhaps not an anomaly, but the subterranean part of my nose bridge is really, really wide. It’s difficult to find comfortable glasses.
I have Webbed toes, (2’nd and 3’rd), Simian Crease, strongly inward curving pinkies, and pronounced canines (think fangs) on the lower set. Oih! and this once is weird. Recently, I seem to be immune to normal vaccination routine. Needles bounce off. I have had several nurses comment that my skin was tough and leathery.
When my right knee is bent, the knee cap doesn’t center itself on the knee as it should; it sits to the side with the left edge of the cap at about where the center should be. Both kneecaps used to go out of joint on an almost daily basis when I was a kid. Did I just hear someone say, “Ouch?” Believe me, it was that and then some!
The lower two or three ribs on my left side protrude much more than they should. When I lay on my back, there’s a definite valley between them and my breast.
My aorta arches to the right instead of the left. This plays hell with my blood pressure.
My chest sorta caves in the middle, not as much as some other cases ive seen but its still pretty noticeable.
I’m pretty lazy and never exercise, but I can put my legs in the lotus position without using my hands. One eyebrow is significantly higher than the other, not real noticeable unless I wear glasses, in which case they always look crooked.
Not only did I have a complete extra set of teeth, so did my husband. Mine kept my baby teeth from falling out, but his came in next to the prior set. I can’t wait to see how much my daughters dental bills are going to be. She got double whammied.
I can wiggle my pinkie toe. I can sit on my butt with my knees on their side in front of me with my feet turned back next to my butt. My first two fingers turn out and my last two fingers turn in. They overlap a bit.
I’m very short-waisted. I’m 5’8" but have a 34" inseam. When I sit down, I am at the same height as someone MUCH shorter than me.
I’m a freak that bred with a freak. My daughter is cursed.
Now, I once demonstrated the both feet behind my head thing at a party (clothed, of course!), and one guy there said that while he’d always thought that would be really hot, it just looked weird.
Hmmm… other weirdness… need to one-up the other freaks… 
I have absurdly strong abdominal muscles. I can do a backbend/bridge/whatever you call it, then raise myself up again using only my abs. This is not so odd for, say, a gymnast, or someone who works out a lot, but even going years without any ab exercises, I can do it. I’ve been known to do 200 crunches after months of not working out, and feeling nothing the next day. I once did 75 upside-down crunches, hanging from a chin-up bar, and could have done more but the guy I was competing with gave up. (What sucks, though, is that however strong they may be, they’re not well-defined. Damn you belly flab!)
I have really long arms. Most people’s armspan from fingertip to fingertip is within an inch or two of their height. Mine’s about 8 inches longer (although my rather broad shoulders might have something to do with this). Those quarter-sleeved shirts end up at my elbow, not on my forearm, and long-sleeved shirts are always too short.
I have a small birthmark beneath my left eye that magically disappears and reappears as I lose or gain weight.
Also, my right ear is about half a centimeter higher on my skull than my left ear. So, my glasses are always crooked. I’m a little surprised that none of my students have mentioned it to me, as they love to point out flaws like that.
This isn’t much, but the fourth toe on each of my feet curves inward so it rests practically under the third toes.
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Having entire extra sets of teeth is like something out of Marilyn Manson’s nightmares. I don’t know why but I find it fascinating and bizarre and dark. AAAHH SO MANY TEETH! It’s like youre half wolf or something.
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This thread is kind of grossing me out in general
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I still have baby teeth and only 2 wisdom teeth but that seems pretty common so I am going to consider myself that much less of a freak. Thanks guys! Also doing those annual physical fitness tests they used to give us in school I always set the record in the “sit and reach” It’s how many inches past your knees you can reach to and hold for a few seconds.