One time when I was small, I saw a movie where a couple was kissing. It obviously cut out the sex part since it was a PG movie. The movie jumped to 9 months later and, viola, a baby was born. From this, I thought babies were made if a guy and a girl swapped spit. I told my friends that and for about a week, the girls would keep their mouths shut around the boys so that the boys wouldn't spit in them.