Turner Classic Movies is having a William Castle festival today, so you should just turn to that channel at 5pm and call it a night. Here's the line-up.
"Mr. Sardonicus" at 5pm. Gimmick: Audiences were given glow in the dark thumbs up and down cards, and before the end of the movie, could vote whether the villain lived or died.
"Strait-Jacket" at 6:45pm. Gimmick: Theater goers were given little paper axes. Not sure what they were supposed to do with those. They were also supposed to keep telling themselves "It's only a movie...it's only a movie..."
"The Tingler" at 8:30pm. Gimmick: Probably the most famous Castle gimmick of all: "Percepto!" Theater seats were rigged to "shock" random movie watchers when the "tingler" escapes into the movie theater.
"13 Ghosts" at 10pm. Gimmick: "Illusion-O," basically 3-D glasses that would reveal the ghosts, or hide them.