This is what's currently visible on the moodle demo site home page. I was not responsible for the defacement, but thought I should bring it to your attention.
Hello there. Thanks for the alert - It's been reported in the tracker MDLSITE-4075 and hopefully should be fixed soon. In the meantime feel free to use the School demo school.demo.moodle.net or else our QA site (which is currently very similar to the sandbox) qa.moodle.net
Thanks Mary. I see that the demo site has refreshed a couple times since then and is now back to the 'defaced' version.