Once, when I was probably too old for this story to be cute (ten or eleven), my parents were away in the middle of the afternoon. I was in charge of the three siblings younger than myself. I took that responsibility very seriously. I also took all of my Stranger Danger training very much to heart. So when someone called for our mother and my little sister TOLD THE STRANGER ON THE PHONE THAT OUR PARENTS WERE NOT HOME, I was pretty sure we were all going to be murdered.
Thus it was our parents returned home to find us huddling in a fort made of couch cushions, out of view of all the windows, clutching knives.
But were any of my siblings murdered by roving strangers cold-calling houses to find out which ones had no parents at home? No they were not. If that wasn't successful babysitting, I don't know what was.