Following his Oscar win for his performance in “Oppenheimer,” Robert Downey Jr. has likened acting in the historical drama to “picking fly s**t out of pepper.”

In an Esquire interview published online last week, Downey explained how filming HBO’s “The Sympathizer” helped him “unwind” from the rigor of his work on Christopher Nolan’s 2023 movie.

“I knew that playing Strauss, in Oppenheimer, was going to be like picking fly shit out of pepper—that it was going to be extremely exacting, that it was going to be . . . not confining, but liberating by its varied implicit limitations of what my usual toolbox is,” he said.

In “Oppenheimer,” Downey portrays Atomic Energy Commission member Lewis Strauss, the nemesis of physicist J. Robert Oppenheimer. Meanwhile, he plays multiple roles in “The Sympathizer,” which HBO describes as an “espionage thriller and cross-culture satire” based on a Pulitzer Prize-winning novel.

In a W Magazine interview published online in January, the former Marvel actor said that playing Strauss was “counterintuitive for me.”

“I know that we’re all mixtures of what our persona is and who we really are. Nolan was inviting me to turn the mirror onto an unexplored portion of myself,” he said.

“And the character, to me, is everybody who has ever felt slighted by somebody who was more important than them. It gave me a lot of time to reflect. I wondered if I’ve come off like that to people in the past. And I wondered if I were them, if I wouldn’t seek to destroy me.”