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I'm a big fan of the "arm of woe" as a non-verbal communication technique to those that would attempt to encroach on my personal space. Granted, it is far more effective when you identify them while moving toward you, as it effectively "cuts them off at the pass".....so to speak.

When you raise your arm in the "stop" mode, and have a serious bearing and countenance, it is a non-verbal signal that you will potentially defend your space. I have yet to have anybody NOT pick up on this non-verbal communication, and anyone that does, more than likely has nefarious intent and will be treated accordingly. Regardless, they will be removed from my personal space.

Used in conjunction with firm, brief, and direct speech, it is an effective tool to separate the common bum from the potential hooligan.