What rare bodily ability are you able to do that could also be alluding to how rare it is?

SenseiSeptred
I can cross my middle finger over my index finger, and I can touch the tip of my tongue to the back of my tongue, and I have grasping toes as an ability (just like a monkey.)
What rare bodily ability are you able to do that could also be alluding to how rare it is?
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