Remember Stanley Kubrick’s 2001: A Space Odyssey?

It begins with a tribe of ape-like creatures being chased away from a watering hole by a larger tribe of ape-like creatures. But the next day, an alien monolith appears and somehow inspires that first tribe of apes to learn how to use bones as weapons. They do so to great effect, chasing the other, larger tribe away from the watering hole. In the end, the victorious leader of the first tribe throws a bone-weapon into the air in celebration.