Back in the early 70s, my mother bought in a tutor to teach my 12 year old brother and my 9 year old self, the Greek language for a couple of hours a week.  Quite where she found him, I'll never know.  He must have been in his 50s and seemed very nice.  He taught us together in my brothers bedroom.  He was very sweet to me and very mild mannered but he had some very strange tendencies.  He would alway end the lesson by wanting to try on my brother's DM's.  Then, he would look at him with a glint in his eye and say 'shall we wrestle?' (it sounds even crazier in Greek).  At this point, he would literally fly through the air, grabbing my brother en route and land on his bed.  My brother proceeded to beat the shit out of him (he was pretty big for his age) but the said tutor didn't seem to mind in the slightest and seemed to be positively enjoying himself.  I was completely bemused. He would then go downstairs to sit and have coffee with my mum.   I think it took me to get past a certain age to realise how strange his behaviour was.  There is a point to all this and it is that our parents were just so trusting in those days.  Mine were in no way naive but I just don't think it occured to them that someone so educated could not be completely trusted.  I also think that children nowadays are alot more aware of what constitutes normal behaviour in an adult.