Movies have always been about the experience—but what happens when theaters try way too hard to make them “immersive”? From vibrating seats to air cannons, from Smell-O-Vision to Sensurround, movie theaters have introduced some wild (and sometimes disastrous) gimmicks over the years.

Some of them revolutionized cinema, while others flopped so hard they disappeared overnight. From William Castle’s buzzing seats to 4DX’s full-blown theme park experience, today we’re diving into the weirdest, wildest, and most ridiculous movie theater gimmicks in history. Buckle up—your seat might start moving!