That scene. Let me see. There were seven takes because Rod Steiger couldn't stop crying. He's one of those actors who loves to cry. We did it over and over again.
Source, in full
Speaking with Truman Capote about the scene with them in the back of a taxi from On the Waterfront, as quoted in "The Duke in His Domain," The New Yorker (1956); reproduced in Rod Steiger: Memoirs of a Friendship (2000) by Tom Hutchinson, p. 88