I broke it. I was the "DROP TABLES" guy, and you'll want to sanitize the text before it goes into the db. I typed "; DROP TABLE `users`; Which made every person stop moving, and then on page reload nothing happens. (So the `users` table is dropped.) Sorry!! I didn't mean to break it, I wanted to test it.
..but if anyone knows why it sometimes freeze, please let us know. We were not excepting this kind of traffic.