There's probably never a time when we will ever have to resort to bone and flint tools, but it's always handy to be able to make tools or survival items from everyday objects, and this is what we have here.
Take your teaspoon and flatten it with a rock or hammer
grind or file your spoon to the desired shape
Cut the stem to the required length and scallop it to allow for gluing or binding
sharpen the edges and fix to the arrow shaft, you'll be surprised just how efficient they are!