I recently downloaded this app that allows you to unlock your Mac by just knocking on your phone. While it’s a cool little party trick, I find myself just typing in my password because it’s simply faster. (I’m also a little peeved that I spent a few dollars on the app). Besides that though I think it’s a really nifty idea, especially since your phone can be in your pocket and you can still knock to unlock. It’s one of those clever ideas no one has ever thought of because there really isn’t a need.