After a slightly complex hip surgery I am unable to walk for some time and can only move around on crutches. If I drop one crutch I manage to pick it up with the help of the other one, but what if I dropped both? As I may not exceed 60° torso to leg and can not put any weight on my right hip, I would have to freeze on one leg there and then.
To avoid that situation I printed myself four emergency crutch lifters that hold neodymium magnets. I attached one to each crutch and wear the other two on a string around my neck. If both my crutches drop I can still go fishing for them now.