Blood clots in the packed red blood cell [PRBC] unit can sometimes go unrecognized and could eventually give rise to flow problems while administering the same. We herein report our observation of a moderately elongated threadlike clot in a PRBC unit prepared from a whole blood donated by a young Indian male donor. The PRBC unit was returned to us from the ward by the nursing staff citing “flow issues”. In fact, this warranted the initiation of root-cause analysis of the entire event led by two faculty members, one post-graduate student and the technical supervisor at our blood centre.