How do you stop strangers from talking to you?

[tanyajack]

Communicate your personal boundaries in a clear, courteous and consistent manner. Then, follow through with them and take measures to ensure that you are respected and safe. Don't give in to any manipulation, or let others bend your values. Stand your ground, defend yourself and others against bullying and mistreatment and simply don't let others walk all over you! Assertiveness involves reminding others when they are manipulating you, saying no without feeling guilty about it and staying true to who you are, even when others aren't of the same opinion.

http://www.youtube.com/watch?v=2mljo6oUubw