My scene was actually a four room shack in the corn maze - called The Slaughter House, you enter the first room which was a coat room/foyer kind of thing (complete with photos of missing persons on the wall, old bloody coats, and a bloody shotgun blast through the wall.....) then turn immediately into a living room with a couch (and a pop out corpse), then immediately into the bedroom in the photos.
In that third room was the bed with the skeleton, my co-star actress who was a living dead girl with her teddy bear, and that wood and chain thing. It was a motion activated monster under the floor -as soon as the customers would cross the doorway into the bedroom, it would activate the trap door. It would shake up and down as if someone - or something - was trying to escape from under the floor. We came up with the lines that it was either other customers trying to get out, or it was Grandma, and she was hungry for more flesh.
From there the customers were forced into my kitchen. :0)