So, if someone's walking directly behind me in the hallway, I never know what to do with my arms. I suddenly become conscious of my stride, and try to control it into a cool swagger, only to realize how restricting it must look, since a "natural" gait, by definition, must be the most natural way I can walk. How many people consciously walk?

So, let's say I grab a drink from the drinking fountain at work. After quenching my thirst, I will take one last swig and not swallow it until roughly I get back to my desk. Or, let's say I send something to the printer at work. I take a drink from my glass and don't officially swallow until after I'm roughly near the printer. This habit of mine only became a conscious one when along this walk I was greeted by a coworker and I gave a bubbly "helgh", swallowed, then gave a gasped "hello" after they were 20 feet away. What is this?? Is this a survival skill I inherited from my chipmunk ancestors? Anyone else crazy like me?