I don't know if it's a big problem any more but I'm given to understand that a lot of Australians have lost cousins and drinking acquaintances to the dreaded drop bears, though perhaps fewer than to various spiders, snakes, crocodiles, sharks and road warriors.
So I was thinking that perhaps an electronic device using a high frequency sound or some kind of wave perhaps enhanced by magnets could be carried that would cause the drop bear to not drop and if that at some minor price could be sold to save future cousins and mates from being lost to these vicious predators. I think that with proper research and testing (a couple weeks in the bush might do?) you could almost guarantee that anyone carrying a functioning drop bear disabler would never be actually harmed by a drop bear. In fact the hard part might be proving that the device does not harm the poor drop bears beyond depriving them of food.
Who knows? I might be worth a grant!