What if the Ghostbusters were sent to deal with the Blair Witch?
Either those guys from the original Ghostbusters movie Peter Venkman, Ray Stantz, Egon along with Dana and Winston, or those women from the new movie were told about the Blair Witch haunting the woods and were sent to deal with her or try to stop her terrorizing the woods.
Might make for a good movie and they deal with ghosts and the paranormal all the time anyway, the Stay Puff Marshmellow Man was no match for them after all, the Witch would be confronted and assaulted head on, dont know if she would win but they would try to fight her and bring the fight to her woods.