My haunted house would include:

A woman in a room breaks a nail, blames the observers, and rushes them with some instrument of distruction.

A couple in the corner making out, you think, but the woman is really dead and the man has blood in his mouth

Screaming coming from an open door, an bloodied man comes to the door, looks around and closes it

Someone looking like a "customer" being chased by a monster. Possibly a shill in the group, gets chased and "killed"

A confused dead person/ghost looking for help from the observer, randomly wandering the hall??

Stick them in a coffin, a small, dark, confined room

A child in a room playing with dolls and taking them apart

A man dancing with a dead woman

A doll maker making live people dolls, à la Jeepers Creepers. i.e. sewing on a person

Person in the middle of a massacre asking "What have I done?" Wants help from observer, is bloody

A person butchering a live person screaming for help

A teacher teaching to a class of students that he has killed

The inevitable dead Prom Queen

An old-fashioned room with a record playing, with scary pitcures on the walls, but nobody in it

A normal looking man passes group and takes his place in a scene above (or below?) Screaming butcheree or sewed person?

I'm much more into the psychological scare than just the boo scare, of course, those are important to. Hmmm, shall we say morbid thoughts on the brain??