City on the Edge of Forever (South Park)
Eric Cartman, Stan Marsh, Kyle Broflovski, and Kenny McCormick get on the bus after the school bell rings. While they are riding the bus, it comes to a dead stop. At first, Cartman thinks the bus is out of gasoline, but he then realizes Ms. Crabtree has stopped the bus. Stan and Kyle both look out the window. They see that the bus is on the edge of a cliff. All the kids on the bus begin running around in fear, and the bus moves every time they move around. Ms. Crabtree urges the kids to stay calm; she gets out of the bus to go get help.