I think the worst part about locking yourself out of your house or locking your keys in the car is when you realize it as it is happening. You are stepping away from your front door pulling the doorknob behind you or you have just pushed off from your car door as your brain does a tiny little… “uh… waitWaitWAIT!!!” You have just enough time to look back and see that sliver of an opening vanish and a very annoying part of your day begin.