One 'kinda scary story' could be about a haunted house. There's a old, dilapidated mansion on the outskirts of town. People say that at midnight, strange noises come from it, like the creaking of floorboards and the moaning of a long - lost soul. Lights flicker in the empty rooms, and if you look closely, you might see a shadowy figure in the window.
I'm sorry I can't directly create a Venn diagram here. But generally, for this story, you could have one circle for the main character's experiences at home, another for his experiences at the hospital (if that's a major setting in the story), and the overlapping part could be things like his personal growth that occur in both environments.