Greta Gerwig attends a ‘Barbie’ press event in Los Angeles on June 25.Photo:Matt Winkelmeyer/WireImage

Matt Winkelmeyer/WireImage
Greta Gerwigis spilling a surprising secret about her blockbuster movie,Barbie.
“I went around to different theaters and sort of stood in the back, and would then also turn up the volume if I felt it wasn’t playing at the perfect level,” she recounted during a screen talk on Sunday at the BFI London Film Festival, according toThe Hollywood Reporter.
She said at one of those sneaky screenings, she heard a woman cracking up over a particularly zingy one-liner about the Proust Barbie. “And I was like, ‘That joke was for you!' ” Gerwig told the festival audience.
Gerwig went on to share that the film was “the most joyful” experience she’s ever had on a set. “So, I thought, if I can make a movie that is half as fun to watch as it was to make, I think maybe we’ve got a shot," she said.
Gerwig also admitted that she sometimes dealt with self-doubt about the script and some of her creative choices, including the much-loved “I’m Just Ken” dance scene, which depicts the numerous Kens fighting.
“That sequence, in particular, was just filled with choices that thrilled me and made me so happy, but then I’d be driving home at the end of the day and thinking, ‘Oh no!’ ” she recalled.
Ryan Gosling and Margot Robbie star in ‘Barbie.'.Warner Bros. Pictures

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
While she continues to bask inBarbie’shistory-making success, Gerwig is also turning her attention to new creative endeavors. She teased that she is working on something new at the moment, but didn’t share any details.
“I’m in the writing process,” she said at the festival, adding that she is still grappling with self-doubt. “It’s hard because I’m having recurring nightmares.”
In July, Gerwig echoed that same sentiment when talking about another upcoming project that will see her directing two Narnia movies, based on acclaimed British author C.S. Lewis’ classicThe Chronicles of Narniabook series.
“I haven’t even really started wrapping my arms around it. But I’m properly scared of it, which feels like a good place to start. I think when I’m scared, it’s always a good sign,” she said on theInside Total Filmpodcast.
“Maybe when I stop being scared, it’ll be like, ‘Okay. Maybe I shouldn’t do that one.’ No, I’m terrified of it. It’s extraordinary. And so we’ll see,” Gerwig continued.
“I hope to make all different kinds of movies in the course of the time I get to make movies, which — it’s a long time, but it’s also limited,” she added. “I want to do big things and small things and everywhere in between, and having another big canvas is exciting and also daunting.”
Sometime in the future, Gerwig also hopes to dive into theBarbieuniverse again andbring fans even more movies.
“There’s a tone and a humor and a joy, and obviously the world is so beautiful,” she told PEOPLE in July, declaring, “I want to go back to Barbie Land.”
source: people.com