I’ll go first. I have a tiny dot scar on the pad of my left thumb from an attempt to extract blood to test for my blood type. I was at a pre-med wannabe summer camp when I was 16, convinced I was going to become a doctor someday. Our first medicine related activity was blood typing and we had to prick ourselves with these weird little needles and extract enough blood to do this test. I stabbed my thumb with this little baby needle twice and a bit too hard the second time because the blood was just not coming out. I never found out my blood type. But now I have this tiny scar.