This Disney-Pixar short was shown before Cars 3. During recess, a bully takes all the kids' toys or other of their valuables and puts them in a box. A flashback is provided that explains some of his behavior... I'll stop there and just say there's some amusing stuff concerning a creature that can only exist in an animated cartoon but it's believable enough to suspend logical thought and it contributed enormously to my enjoyment of this short. Really, all I'll say now is I recommend LOU.
