No one does anything stupid. That is what elevates the movie to a true suspense flick (if B level) as opposed to a schlock horror film that has screams but no suspense. Very little on screen violence, and the movie isn't distorted around Leelee.
It is also, to this chick's way of thinking, extremely funny.
I'm trying to think of some other good suspense flicks in the same genre and can't. All that came to mind is Diabolique, which is A level and not funny. But that is the kind of anxiety it provokes, at its best. Lots of fun, not to be taken seriously, and definitely bruised forearm.