My teacher was in Chinese secret service during WWII. What I have learned from him about "situational awareness" are
1. Never let anybody to close the car door behind you - When you step one foot in your car, if your opponent closes the car door at that moment, he can hurt your leg.
2. Always sit next to the exit when you watch in movie theater - You can escape faster if needed.
3. Before you start eating in a restaurant, always go to the kitchen and talk to the chef - Make sure the chef is not your enemy and tries to poison you.
4. Don't allow anybody to pull hot tea into your cup - He can throw hot water on your face and then beat you up.
5. Don't allow anybody to use both hands to shake one of your hand - He can apply wrist lock on you.
6. Make sure your bed doesn't face to your bedroom door - Someone can open your bedroom door and shot you while you are on bed.
7. When you walk on the street, always look for brick on the ground - In case you nee d to get into a fight, you can pick it up and use it (I add this one in myself).

8. ...