I saw this today and thought "Brilliant." Many people donate hundreds of hours of volunteer time a year. There are some who don't volunteer at all. If this offer opens the eyes of just a few people to the joys of volunteering, it's worth it. For myself, I learned about volunteering from my parents; active in both the community and in our church. As a child, you do what your family encourages you to do. As an adult you make a conscious choice whether you will focus entirely on yourself or if you will share your time, talents and resources with others.
Looking for a sign? Here you go.