Overcrowded

I've always been a fan of people who appear to have no spatial awareness whatsoever. The people that you see in public places, usually crowded public places, that just have that look on their face like "I have no idea how I got here."  Kinda like this:

I've been running into a lot of these people lately. When I say running into, I literally mean smashing my car into their bodies.  Not really, but one can hope.  I just don't understand how you can have no concept of what's going on around you. 

Can we come up with a way to weed these people out?