Jesica Santillam, 17, suffers from a heart deformity…|After a three-year wait, she received a transplant on February 7 with organs flown from Boston to the Duke University Hospital in Durham, North Carolina….The organs were sent with paperwork correctly listing the donor’s blood type, says Sean Fitzpatrick of the New England Organ Bank.|But somehow, no one identified the donor had type-A blood while Jesica is O-positive. —Girl gravely ill in US after receiving organs with wrong blood typeAnanova)

While this sort of thing happens extremely rarely, it shows that proofreading can save lives… or take them.