Put "It's only a movie, it's only a movie, it's only a movie..." on it? I know of The Last House on the Left, Don't Look in the Basement, and this.
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Fear What's Inside...
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The US poster for "Don't Open the Window" had that same tag line. It was known in Europe as "Let Sleeping Corpses Lie" and "The Living Dead at Manchester Morgue". The poster for this film, however, was designed to really look like it had something to do with "Last House on the Left".
groovydoom.blogspot.com
As far as I know, four:
Last House on the Left
Don’t Look in the Basement
The House That Vanished
Don’t Open the Window