Deep in the Andes in Colombia, the locals cross steep chasms using thick ropes strung across the gap: a homemade zip line. It's terrifying and dangerous, but is the way many commute across the chasm. People use it to transport all manner of goods and often crowd on three at a time. Do they fall? You bet. And one man was decapitated by the line.
Read Joshua Foer's account on Slate.