I did believe in demons and 'true stories' of them were floating around as long as I remember... I was a born in JW. Not surprisingly, things happened I and my sisters then interpreted as resulting from demonic influence. We never wanted to be left alone in the house. Our parents and some family friends fed us those stories and the 'truth' of them was confirmed in the meetings at the kingdom hall and in the WT books... also in the books targeted at children. I also remember too well the booklet Unseen Spirits—Do They Help Us? Or Do They Harm Us? Later, those 'encounters' in part also kept us in JWs, strengthening our beliefs.
It seems so amazing now what kind of a world we then lived in. Any neighbor or school teacher or kid in the block could have an invisible demon sitting on his/her shoulder.