Spent the last few days at Niagara Falls and they have a 4D movie theater there and we watched the 4 seasons of the Falls (Spring, Summer.... etc) as well as a fly-by.
The theater was really kind of unique. No chairs, just bars to hold onto on a round platform in the middle of the (round) theater. The screen went all the way around the theater (360 degrees). You had to use a walkway to get onto the platform because it was actually surrounded by water (kind of like a mote all the way around). The screen stopped about 5 feet off the ground at which point real water falling to place. There was a snow machine somewhere up in the roof making snow (and cold) for the Winter season, and of course they gave us rain ponchos at the door before entering because " you're going to get wet" (which we did).
The platform actually moved and tilted during the fly-by party of the movie.
Pretty interesting overall!