That's the worst address bar virus I've seen yet. Back button has a seizure. Restoring sanity requires closing the tab (or just reboot). It's probably a law of nature that a certain fraction of creative energy goes into bad jokes like this.
As for the back button, I would argue that this is a problem that browsers should solve. Even in the wild, it happens often that the first page immediately redirects (via JS) to some other page - good luck using the Back button then. Maybe the page that wasn't displayed for more than ~1s shouldn't exist in history at all, or at least shouldn't be taken into account when pressing Back button? I'm sure even better solutions exist.