Part of situational awareness is knowing where to eat lunch. 
Driving away could be an option. Keeping doors locked and windows up helps.
Sticking the gun in your crotch (between legs) might work... depending on the gun. I would not do this with my Glock but have with my S&W 442 JFrame revolver. Keeping an eye on your mirrors is beneficial.
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"Detached reflection cannot be demanded in the presence of an uplifted knife." by Justice Oliver Wendell Holmes, Jr. in Brown v. United States, 256 U.S. 335, 343 (16 May 1921).
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