What are any noticeable interesting characteristics you have noticed that are unique to some certain persons..?

It is true am a known ability some people have:
"In medicine, Gorlin sign is the ability to touch the tip of the nose with the tongue.^[1] Approximately ten percent of the general population can perform this act, whereas fifty percent of people with the inherited connective tissue disorder, Ehlers-Danlos syndrome, can. Not to be confused with Gorlin Syndrome; it is named for Robert J. Gorlin."
^{https://en.wikipedia.org/wiki/Gorlin_sign}