I've used my right hand my entire life, but ever since I've started working at a pharmacy, I've notcied that I've been using my left had a TON more. It's really freaky, because I was just thinking about it yesterday afternoon as I opened every single pill bottle that day with my left hand twisting instead of my right, which I used to do. This was before I even read the thread. Seriously strange. I haven't started writing left handed, but definetly have seen an increase in left handed use 🙂