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Personally, I've always tended to back myself up against a wall, or get in the car and lock the doors if I just have to take a call in public.
Working graveyard shift, I see this one a lot:
People go to lunch or break at 2AM and spend the entire time on the phone. I think I've made personal calls between midnight and 0600 about a dozen times in my life, and most of them involved somebody going to the hospital or occasionally a wake up call for my wife when she had an early morning business trip.I always marvel upon landing on a redeye flight from the West Coast at how many people immediately take out their phones and begin dialing. It's 5:30 a.m. — 2:30 in the city they've left. Who are they calling?