House On Haunted Hill (1958)

House On Haunted Hill is the only film to be made with the quaint cinematic process known as Emergo. Now, Emergo was an early prototype of a truly holographic 3D movie process that wouldn't require the audience to wear silly glasses. Emergo was a simple motion path generator consisting basically of a...skeleton...on a wire. There's a point in the film when the skeleton would be pushed out from the top of the screen along a wire above the heads of the audience. They stopped it when kids kept shooting at the skeleton with BB guns and, in some neighbourhoods, Uzis.