Yeah, I've done some of these kinda things before. There was this cool one. I ask a random guy for directions. 2 people, carrying something big and long like a door/ply-board/etc. come between us, and I switch with one of the guys carrying the door. Almost half the time, the person who was giving me directions didn't notice that the guy he was talking to was someone else. It's rather amazing how bad we are at noticing change.








