The cars’ trunks had been crushed like soda cans and fashioned into jagged, knifelike battering rams. As the vehicles strategically crashed into each other and kicked up dirt into the audiences’ eyes and mouths at the Wasatch County Events Complex, an unwitting passenger could be spotted strapped to one car’s trunk: Elmo from “Sesame Street.” Even though he’d been rammed and had watched a car flip over only a stone’s throw away from him, Elmo wa…