Common Courtesy
I do most of my riding along a multi-use path. Just as the name implies I pass other cyclists, walkers, jogger, etc. As I pass them I say to each "Good Morning" some return the greeting others do not know your alive! What is the big deal to return a simple greeting? I'm not stopping to have a conversation with them or ask them about their personal live, just a simple "Good Morning".
Hell, is there some kind of law against returning a greeting? Have we become so self absorbed that we can not return a persons kindness? Am I only person who does this? Do others also experience the samething?