I've used mine (actually an old St. Johns ambulance association sling) for the usual lot, i.e. to:
-save other people's brains from frying a few times
-pre-filter water
-sling
-carry items

I just came back from 7 months in Gabon, habituating wild chimpanzees and gorillas in Loango national park. In order to try to find underground honey chambers where chimps had dug for underground bees nests, we would push old tent poles into the ground. More than a few times my slingdana ended up being necessary in order to be able to pull our perforating tool out of the ground, what with humidity, sweat, grease.

I also never thought that my leatherman would be used to saw through a chimp bone!