"The bottom"

My daughter saw this Pixar short before Ratatouille exactly one year ago, and she's still talking about it. She calls it "The bottom" (watch and you'll find out why) and she's completely fixated on it. She's thinks "the bottom" is going to get her. And she was so worried she'd be forced to see "the bottom" again that she became hysterical during the opening credits of Kung-Fu Panda and Josh had to take her home.