The NPR story below reminds me of my many blunders in the US, at the very beginning, along the way, and even today. Many times, one should be able to learn things quickly when he/she is in a new country, if he/she observes others. But, what do you do when you go to a country where personal space is next to zero? If you walk out of a long line, you may never get your (train) ticket.

http://www.npr.org/sections/goatsandsoda/2015/06/27/417415574/learning-the-hard-way-why-you-just-shouldnt-gettooclose