"Why do you walk so fast?"
In any big city, people tend to walk more faster than normal. I do not know whether they try to walk fast because of their busy life. Or they just tried to pretend that they are busy.
Here is the funny thing that I have observed from people all around Europe and Asia. People in big city, they walk faster, and the wave between their hands when they walked is really small. However, if you looked at the people from the countryside, they tend to walk slower, and the wave between their hands are bigger.
So now just try to sit in the terrace of a coffee shop, and start to observe :)