Think of the most trivial need you can. Someone wants a bucket of sand. A packet of chips. A left shoe. Something utterly mundane and petty.

Your task is now to write the scenario where that need is world-ending. They'd give everything they had for that shoe. And you have to show why. Why is that shoe suddenly so crucial? What terrible fate will befall without the protection of that packet of chips? What will they lose, for want of a bucket?

Go for comedy if you like - depending on the need you decided, there may be simply no way to suspend disbelief without absurdity. But make sure you communicate real need for this item, with real stakes.