Wisconsin probes how 8 roller-coaster riders became trapped upside down for hours | AP News
Amazon.com: Step2 Up & Down Roller Coaster Toy for Kids, Ride On Push Car, Indoor/Outdoor Playset, Toddler Ages 2-5 Years Old, Compact Storage, Max Weight 50 lb. : Toys & Games
Crazy moment roller coaster stops, strands riders upside down
Everyday Mysteries: Why don't I fall out of an upside-down roller coaster?