It may have been the film that “launched [Meryl] Streep’s legend,” but the filming process for  Kramer vs. Kramer was one of immense struggle, a struggle that eventually paid off in the form of Meryl Streep’s first Academy Award in 1980.

The cover story for Vanity Fair’s April 2016 issue takes the form of an adaptation from Michael Shulman’s soon-to-be-released biography of Meryl Streep titled Her Again: Becoming Meryl Streep. The story focuses on the tense relationship between Streep and her costar, Dustin Hoffman – a relationship that included physical altercation, emotional abuse and intimidation.

Perhaps the most shocking revelation to come from the story is one that addresses a stunt that Hoffman pulled before shooting a scene on the second day of filming.  Improvising his lines, Dustin delivered a slap of a different sort: outside the elevator, he started taunting Meryl about John Cazale, jabbing her with remarks about his cancer and his death.