George Clooney once gave Ben Affleck advice from one Batman to another.

Clooney starred in the 1997’s “Batman & Robin” — often touted as one of, if not the worst, Batman movie to ever violate movie theatres and VHS tapes. That is why Clooney warned Affleck about playing the masked vigilante.

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“[Arnold] Schwarzenegger was paid, I think, $25 million for that, which was like 20 times more than I was paid for it — and, you know, we never even worked together! We worked together one day,” he told a recent Hollywood Reporter podcast. “But I took all the heat.”

“Now, fair deal: I was playing Batman and I wasn’t good in it, and it wasn’t a good film. But what I learned from that failure was, I had to rethink how I was working,” he continued. “Because now I wasn’t just an actor getting a role, I was being held responsible for the film itself.”

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The experience stuck with Clooney, so much so that he discussed it with his fellow A-lister Affleck. “I actually did talk to him about it. I said, ‘Don’t do it,’” Clooney remembered. “It was only from my experience, which is, you know.”

Despite the words of caution, Affleck went on to play the Dark Knight in “Batman v Superman: Dawn of Justice” and “Justice League”, plus a cameo in “Suicide Squad”. A part that many felt he should have passed on.