Privacy is an important thing, and not everyone pays attention to those "do not disturb" signs you can hang on your doorknob. If you really want to send a message, The Doorknob Condition is tough to miss. It's a fancy knob that can be pulled right into the door, making it impossible for anyone to even try to enter.

It's a pretty neat idea, and a cool looking one at that, although I don't know how much more effective this would be compared to, say, locking your door. Unless people trying the knob and rattling it is really, really annoying to you, your current doorknob probably has all the features you need to ensure your privacy already. But this one looks so cool! — Adam Frucci

Yanko Design, via Geekologie