It's normal. When I go out to eat I refuse to sit in a chair unless I'm with a larger party, in which case I don't want to ruin people's meals by making them wait for a booth to open up. I also look for weapons at hand, their height, how they move, their hands (strong, bony, etc.), their shoes (steel toes, vans, loafers, etc.), and their pants (any giveaway bulge in their pants to reveal a weapon).
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Free will lies not in the ability to craft your own fate, but in not knowing what your fate is. --Me
"I have just returned from visting the Marines at the front, and there is not a finer fighting organization in the world." --Douglas MacArthur
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