Another scary story could be about a ghostly figure in an old attic. 'I see a white thing in attic. It float. I don't know what is it. I don't want go there no more.' The simplicity of the language gives a sense of a childlike fear, which can be very effective in a scary story.
There's a story of a cursed forest. In this 'bad English' version, it might go like 'In the forest, there is a bad thing. It follow me. I run, but it always there. I feel cold and afraid.' The lack of perfect grammar adds to the eerie feeling. The forest seems more menacing with these simple, somewhat broken sentences.
Sure. One 'bad English' scary story could be about a haunted house where a girl hears strange noises at night. 'I go to the old house. It make creaky sound. I very scared.' Simple words but still spooky.