This paper draws on an in-depth phenomenological analysis of some interviews taken from volunteers, inviting them to reflect on their lived experiences of meaningfulness in the context of volunteering and citizenship. It is found that while some testimonies reinforce the standard conceptions of meaningfulness, other testimonies vary from it. The main challenge of this contribution consists in phenomenologically describing this alternative picture of meaningfulness, depicted as the event of witnessing. In a final part, the authors consider how volunteering is at (...) times especially prone to further experiences of witnessing. (shrink)