I tell my kids, "If anyone ever hurts you or snatches you and they tell you if you scream or tell they will kill you,kill mommy,or kill daddy; you better scream as loud as you can because they will probably kill you anyway!"
I know that sounds cruel and I know it terrifies them but I want them to be terrified of people who will hurt them. I've told them all, "fight, kick, scream, throw up on em, wet your pants and never ever stop fighting!" I know it sounds drastic but the truth is...if you are a child and you are snatched, your abductor is most likely not going to let you live so I say fight for your life and as soon as you have an opportunity, run to the nearest most populated area screaming "Help! He's not my Dad!" or Help!" She's not my Mom!"