Everyone clotheslines themselves on a guy line eventually. It happens on the walk back from the fire, usually carrying something, usually in front of people.

This cord has reflective tracer woven through it, so a headlamp picks it out from twenty feet away. It is the cheapest upgrade you can make to a camp, and the first one people make after they have gone down once.

Also genuinely useful for the awning lines on a rooftop tent, which sit at exactly shin height and are invisible at night.