The Ultimate "Bit Part" In An Epic Production

A young girl hikes up her skirt and pulls down her drawers, squatting in a small grove to relieve herself, only to be bitten on the butt by a rattlesnake.  In the next shot, she lies beside her grave alongside the Oregon Trail.

It's 1883, and "God doesn't care in the least about us," as we are told by our impossibly beautiful narrator/protaganist.