Margot Robbie really did that intricate foot stunt in 'The Suicide Squad' where she had to flip her toes backwards to open a lock

• Warning: There are spoilers ahead for "The Suicide Squad."
• Late in the film, Harley Quinn (Margot Robbie) uses her toes to snatch a key and free herself.
• Director James Gunn said Robbie really performed the stunt though her costume blocks her face.

One of the most impressive scenes in James Gunn's "The Suicide Squad" comes late in the film.

Harley Quinn's (Margot Robbie) hands are locked up as she hangs from a ceiling. After killing one of her captors, Harley grabs the keys with her bare feet and effortlessly contorts her body, flipping her toes backwards to place the key into the lock over her head, unlock it, and land straight on the ground.

The scene is more impressive once you know Robbie performed the stunt on her own without the help of a stunt double.

"The hardest thing I asked her to do was something I never thought she would be able to do," director James Gunn said on "Jimmy Kimmel Live!" in July while discussing the scene.

"She is like a human Swiss army knife who was able to flip herself backwards do this," he continued. "Watching this scene with her flipping backwards was just beyond incredible and I was so happy that it worked."

You probably wouldn't know that because Robbie's face is blocked in the scene by lace on her dress, something which Gunn was upset with after rewatching the scene in the edit room.

"You have this little cuff next to your on your outfit that covers her face so it looks like it's a stunt person, but it's Margot doing it in the movie," said Gunn. "Honestly, my biggest regret in the whole movie is not going in there with the scissors, but i was so mesmerized that you were doing it."

"That was me," Robbie said, explaining, "I'm very dexterous with with my toes. I could braid someone's hair with my toes, I reckon."

"I could pick a lock no problem," the actress added.

Robbie said when Gunn initially ran it by her he told her not to worry and that they'd cut it to make it work and she told him she felt like she could do it.

At one point, they thought someone else may need to do the scene because Robbie may have been needed on another set. But Robbie mentioned that the film's editor, who also worked on "Once Upon a Time in Hollywood," could tell the difference between Robbie's feet and another's, suggesting it wouldn't work.

"Believe me, I'm on Twitter. I know people want to see your feet," Gunn said, adding that he was a bit bewildered that people kept asking him if they would get to see the actress' feet in "The Suicide Squad."

"That's what you're thinking about? We've got huge bombs. We've got buildings fall over. We've got Idris Elba, John Cena, Margot Robbie - all these great people," said Gunn.

"But those are the stars," he added, pointing at Robbie's feet.

You can watch Robbie and Gunn discuss how the scene came together below. It starts at the 11:35 mark.

"The Suicide Squad" is now in theaters and streaming on HBO Max. You can read our review here.