Escalators

Escalators. So here you are behind a line of people that are moving politely up the elevator when you get close to the top the people at the very end suddenly become elevator edge shy. And they just stop as the edge looms closer and everyone behind them must sit and wait for them to do the simplest task of stepping over the edge. Why is this so difficult for some? Surely they must understand that the people behind them are staring angrily at the back of their necks muttering curses …. But no, it seems it's the edge is what they fear most.