A chat over tequila with director Andy Muschietti ended with a brand-new, terrifying sequence not in the book.

And the movie is very much about that.

Bill, played as an adolescent in the 2017 film by Jaeden Martell, is now a Hollywood screenwriter.

WithIt, he felt an “overwhelming sentimentality” as his own recollections blurred with Bill’s.

(Muschietti was her director on 2013’sMama.)

Being a major King fan, McAvoy squealed internally.

A few months later, McAvoy finally got the official call.

It’s a moment that emerged over drinks tequila, to be exact between the actor and director.

“I said to Andy, “What can we do?

‘…and literally in 50 minutes, he invented a whole new sequence.

It was never in the script, and it isn’t in the book.

It’s brilliant.”

“They’re completely different [roles],” he says.

You know, the usual.