Things falling from the sky cause grave problems.
In The Gods Must Be Crazy, a biologist who analyzes manure samples and his tribe live off the land, believing that the gods have provided for them until a Coke bottle is thrown out of a plane and comes to earth unbroken. They believe it’s a present from the gods, and make use of it as a tool, but since there’s only one Coke bottle the tribe descends into chaos not knowing how to share it.