Well we have 4Dplexes here in México and 2 weeks ago Jurassic Park 3D was shown. Now, this is a 4D cineplex which means the seats have vibration devices, they have things on the back that can poke you, they have air jets on the back. The theater is packed with fans (on the sides, so in the helicopter scene there was high wind inside the theater), strobes and smoke machines on the front. The front seats have water jets and air jets as well to be ejected in your face. Finally you have smell in the theater. The seats before the showing starts raise from the floor and you are completely hanging, so there is a lot more movement, like a lot. Watching JP in 4D was an amazing experience... Will post this in a Jurassic Park realted post as well...