There are so many! What came to mind is about head hair. In many cases if a person loses a lot of their head hair (i.e. from chemo or other reason, like Lithium/medication hair loss, extreme stress) it frequently grows back curly or curlier than in the past. It happened to me, and apparently there is support for this fact. I'm not sure if it happens to people with racial backgrounds where hair is always straight (like some East Asians), though.

Is your natural head hair a different color in adulthood than it was in early childhood? And or texture different?