^i met a kid in kathmandu who had an extra thumb sticking out the side of his hand.
when waiting at a pedestrian crossing, if i see an opening in the traffic for me to walk through, i am mindful of people blindly following me onto the road (VERY common around the city). if i do see some blind followers, i get their attention and point out any vehicles potentially harmful to them. i've done this so many times, it has become instinctual. i do it without thinking.