Grudge may just be my favorite horror movie of all time lol.
The unsuspecting people in this scenario have taken a bet to stay in the haunted house for 5 days total. They are unaware of its history and just assume it's a normal house until the apparition reveals itself.
Some ideas just for fun:
Batman
Master Chief
Stephen Strange
How would they do/react? :P
Who else could survive The Grudge? Who COULDN'T?
https://youtu.be/YC3bzK_i9_s