I'm giving these guys props for coming up with a cool idea. Max Lesser and Andy Chen are apparently a couple of roomies that kept losing their keys and took matters into their own hands to come up with a solution - which for them was programming a secret series of knocks that activates a key dispensing mechanism. Just use your secret knock, the key is dispensed and then put the key back in the dispenser once you enter. Here's their video on how it works:
Cool idea guys, but i think i'll just keep using my Emtek Emtouch Keyless Lock. Maybe not as fun, but less complicated and no keys required at all. I'm just sure i'd forget to put the key back in the knock knock lock, but I can set my own key code and remember it. Keep being creative though. I wish someone would invent a good public restroom lock that would open without me having to touch the door after I wash my hands.