"What I Saw at the Abortion Clinic" by Richard Selzer.
In this article he talks about witnessing a 19 week old fetus being aborted by an injection procedure no longer in use. He described the abortionist sliding the needle of the syringe into the woman's belly, and then, he writes, "I see something other than what I expected to (see) here... it is the hub of the needle that is in the woman's belly that has jerked. First to one side. Then to the other side. Once more it wobbles, is tugged, like a fishing line nibbled by a sunfish." This image horrified him. Selzer concludes his essay: "Whatever else is said in abortion's defense, this vision will not vanish from my eyes. And it has happened that you cannot reason with me now. For what can language do against the truth of what I saw?"