Go to the [Index] menu on the disc. On the first page of the menu, an icon of an Omnidroid will appear after a while. Press the [Up] arrow key on your remote control to highlight the icon, then press [Enter]. You'll see a clip about the cake-eating scene. On the second page of the menu, an icon of an Omnidroid will eventually appear in the top right-hand corner of the screen. Press [Up] and then [Enter] to see a Pixar employee being attacked by a big red ball.