What you do in your web browser when you switch it to porn mode is your own business. As long as nobody comes along and opens up the door unexpectedly. If only there was some way to ensure that you’d never find yourself in that situation. Maybe someone clever will invent something that keeps unexpected guests from bursting in on you when you’re at your most vulnerable… or least clothed… or both!Well, now there is, thanks to the brilliant minds at the Useless Duck Company!Yes, the same people who brought you the only automatic toilet paper dispenser that’s officially endorsed by Ash Williams (well, it would be if Ash was a real person, anyway) have now invented a physical privacy tool that works in conjunction with your browser’s software privacy tools.It’s a door lock that automatically engages when you flip the private browsing switch. You know, to shop for engagement rings without your fiancee finding out… and other far more believable uses for private browsing mode. Like checking your second Gmail account and whatnot.Ordinarily you might lock your door manually to make sure you won’t be disturbed. If, however, you happen to forget then Useless Duck’s auto-lock has your back…. which, as the company notes on the YouTube video, is super handy if you don’t want your wife to catch you shopping — or doing that other thing that ends in”pping” and rhymes with tapping.Once you’ve finished… your shopping… the lock automatically opens back up, because you don’t want people encountering a locked door unless it’s absolutely necessary. That just leads to a whole bunch of questions that no one really wants to hear the answers to.