Attention cats: When a gentle knock on the door doesn't give you access to your master's quarters, sometimes you just have to be aggressive. Be-e aggressive. We're not talking punching through entryways with your paws. We're suggesting a more innovative, efficient manner. Watch this Japanese kitty for instructions. First, pick the door which you would like to open. Second, turn around. Third, thump your back leg like a rabbit. Mission accomplished. Well, maybe not, but you definitely have their attention now.