Drop bear

Drop Bears are a species of large carnivorous marsupials resembling the common koala, the Drop Bear originates from Australian fakelore. They were created by Australians largely to mess with tourists.

Australians would claim that the Drop Bears lays await in treetops and patiently wait for a human or another prey to walk beneath them, When someone walks beneath a drop bear's tree-branch it will let itself drop from the treetops and onto the top of a prey's head.