When the Chromebook Pixel is configured to run Linux through Crouton/chroot, it displays a warning on reboot and will automatically reflash the machine to stock

When the Chromebook Pixel is configured to run Linux through Crouton/chroot, it displays a warning on reboot and will automatically reflash the machine to stock ChromeOS without intervention. Not a great option if there's a chance someone non-technical will try to use the machine.