I do know because I still have my vaccination scar...I got it when I was a kid, I think it was in kindergarten, and they used a vaccination gun, remember those? What I remember is waiting in line with other kids, and some were really scared. I was too, but I wanted to prove I was tough so I held my tears and tried to show no weakness. But man it hurt and it hurt for days. But then as I was growing up I remember showing the scar to other kids and feeling proud of it. Do you have that scar? SHARE if you remember what that scar was for....