When I was young in Bulgaria I observed my parents and family getting up out of chairs and walking when we went to places.

I learned that most people write with their right hand, a few write with their left. And I noticed that each time a family member would walk somewhere they used their right leg first. I don't think there is much value in this memory, but I would make a scientific hypothesis that a few people in our world are left footed. Don't actually think that's a word but anyway.