From The National Geographic:
Perhaps not since the Cowardly Lion has an animal’s appearance been so at odds with its attitude. On June 4 a black bear wandered into a West Milford, New Jersey, back yard, was confronted by a 15-pound (7-kilogram) tabby cat … and fled up a neighbor’s tree. Hissing at the base of the tree, Jack the clawless cat kept the bear at bay for about 15 minutes, then ran him up another tree after an attempted escape.
Finally, Jack’s owner, Donna Dickey, called the cat inside, and the timorous trespasser disappeared back into the woods.
More here.