Once when I was home alone, a man called for my parents.  When he realised that they weren’t home, he kept me talking and revealed enough for me to know he knew my family well.  He then started to question me about my sexual experience, and whether I would be interested in having sex with him.  He also asked me if any of my friends would join us.  At the time I was terrified and yet unable to hang up.  It was like being in a train wreck.  In hindsight I realise he was probably using me for phone sex, though I was too young to understand.  Because it was only one call and I didn’t get enough detail, they never tracked the caller.