Iowa Derby Car Jump

Photograph by Joel Sartore

Iowa's derby stunts are always a blast: Gregory "Dr. Danger" Carpenter performed the Suicide Car Jump a 50-foot, 60-mile-an-hour leap from a flaming ramp into a four-stack of junked cars 38 times last year, with three hospital trips and no life or health insurance. Despite cracked bones and burns, "I squeak by each time," he says.