ive heard so many demon stories in my jw life. its enough for two lifes.
im from europe and the smurf stories were not as big as in america here. a lot of jw parents wont allow their kids to watch the smurfs though. i was one of the lucky kids who were allowed to watch the smurfs! i also had some smurftoys :-) since we didnt know that smurfs are demonic possessed entities we never saw anything supernatural, let alone a smurf getting alive.
i remember my mum telling me with big eyes the story of a sister in a neighbour congregation who has some demon possessed stuff which resulted in *all* doors being open (cupboard doors as well as room doors) in her flat whenever everyone left. even when the elders visited her. as soon she trew away the possessed stuff (i dont remember what it was, a book or something) it all ceased to happen.
one sister had serious doubts that satan exists and prayed to god that he may help her to believe. as soon as the prayer ended the door rang, she opened the door and satan himself stood in front of it. the story missed the detail how she knew it was satan and what happened next (whether he talked or just disappeared).
an jw friend of mine knew another jw friend who was working in a madhouse (in exchange for not going to the army). one day a patient walked next to him while he was cleaning the floor and told him: "youre one of gods true servants!"
i feared demons a lot. threw away expensive video games and music. someday i stopped being superstitious and i never had any demon encounter.
i often believed demons wouldnt show to me because it would strengthen my faith.