Well, here's a story my friend's mom said happened to her..
She said that when she was young, she was at some house or cottage or something with her cousin and a friend. They were sitting on the floor of a room, discussing scary things/the devil.. etc. And then she said that the floor opened up, and the hole was all fiery and red, and the friend got grabbed and taken in

. Then the floor closed up and everything was normal, except that no one had any memory of this girl that got grabbed into the hole. They talked to her parents, and anyone that knew this girl and no one had any recollection that she ever existed. Even they could not remember her name anymore and had a hard time remembering what she looked like. But my friend's mom said that both her and her cousin still remember this event happening.