A black bear tried to explorer this household near Anchorage, Alaska. It could be (but not very likely) dangerous for the family who was living there. However, Nani the family cat stood up to protect the house. In the video, Nani is seen sizing up the bear before she pounced at the glass. The hissing and (kungfu like) fierce act of the cat astonished the bear, scaring him back into the jungle.
More info: Youtube