That's especially true in lines. In India, I have waited in lines at train stations, cinema halls and banks with 100 or more people. The line acted like one organism, every individual connected, everyone inching forward at the slightest hint of movement.
When I moved to the United States, I didn't quite understand the idea of personal space — both in terms of privacy and body contact. It took me quite a while to understand that I didn't have to stand right behind the guy in a line — when I say right behind I mean my body touching his — waiting to get on the train or to order food at a café.