Millions of years of my mammalian ancestors being hunted has had an impact on how my brain is wired. I do not like things sneaking up behind me, no matter what I am doing.

I know I am not going to be eaten while working in an office building, but that does not stop my brain from sending a surge of adrenaline into my bloodstream when somebody unexpectedly appears behind me. Those adrenaline surges are not conducive to concentration or productivity..