Do yourself a favor and stream this terrifying 1989 made-for-television horror movie. It even terrified Mike Flanagan.

The 1989 movie classic "National Lampoon's Christmas Vacation" — which tells the story of Clark Griswold trying to put on the perfect Christmas for his family — filmed many of its scenes in ...

Although it was not the only improvisation in the movie that made it into the final cut ... giving viewers another of the most memorable moments of 1989′s Batman.