There's a weird sound. No idea what it is. It's late at night and you're all alone. Is that sound an intruder, a cat outside, or a moment of imagination gone wild? Fight or Flight nerves kick in. But, what if that sound was your mate coming home instead of an intruder Would the Fight or Flight System still have you revved up in nerves? Read on to check out the role of the brain in all of this... in a non-scientific way.