On the drive into work today, I passed by one of my coworkers as he was walking into work. I saw him and drove right by.
The reason for not stopping wasn't a snub - it was done out of respect for his privacy. We all need quiet time to be with ourselves and prepare for the day. For me, the trip to work has become a transition period, where I put away all the home thoughts and mentally pull out the work "to do" lists and bring forward the knowledge and memories necessary for dealing with coworkers and job issues. Having someone cut that time short really throws me off.
As I drove towards him (he on the sidewalk, me on the street), I saw him purposefully striding towards the office, still blocks away. I decided to let him have his time. A simple gift that will go unnoticed, but one that would be missed if it were snatched away.