The Centennial Screamer is a ride at Lagoon Amusement Park in Farmington, Utah. The ride is somewhat like a giant disk, with 20 cars all situated around it. The cars can rock side to side. Once the ride starts, the disk starts rotating in a clockwise motion. The cars, being on the outside of the disk, receive quite a bit of centrifugal force. As the ride spins faster, the cars stop rocking and are pushed out to a nearly horizantal position. Then things get interesting. A giant boom lifts the disk up to 87 degrees. At this point, the cars are spinning so fast, they can go upside down over and over again with enough centrifugal force so that it overcomes gravity. A similar effect happens if you were to swing a bucket of water around and around. The water would not spill out. Replace the bucket with a ride car and the water with you. You can see how strong the effect is at about 0:31, where I lose control of my camera. For the rest of the ride, I have to fight to get it back up. After a little while of flipping upside down over and over again, the ride is lowered down back to its original position. It slows down until it stops, and you are let out. The part I like about this ride is that the cars have a roof, a floor, walls made of metal bars... but no seat belt, lap bar, or any safety restraints at all. The ride is spinning so fast that you don't need them. Well, who knew how scientific putting a roller coaster video on YouTube could be? I didn't!