Other than the normal walking Smurfs and demonized troll dolls, here's a couple of local ones I heard growing up.
For years I was told this story about my sister's aunt-in-law. She was a special pioneer and was rooming with a "worldly" woman. She started having demon attacks at night, when she was in bed. During the attacks, she couldn't breathe and felt like someone was choking her. She soon discovered (ta da!) that her roommate was involved in satanism and she threw the roommate out, but the attacks continued. After searching the house, she found hidden away in a closet a picture of the roommate. When she took it outside to burn it, the picture burned down to the woman's face and then wouldn't burn any more. After much praying and many doses of lighter fluid, the face finally burned and the demon attacks stopped.
Sound familiar? I've heard many similar stories. Well, a few years ago I met up with this woman's daughter and I told her about this story. She laughed and said that nothing like that ever happened to her mother.
Another one that happened in our congregation about 20 years ago was that one family was attending the district assembly in Texas (we lived in Colorado) and a friend of theirs reported that the mother of this family had personally witnessed Glen Campbell getting baptized. The congregation waited in anticipation for herto get home so they could hear all about it and see if she had pictures. When the family got home, the woman didn't know what people were talking about and where the story came from. :-)