Margot Robbie Explains Harley Quinn Movie Title

The actress also revealed a fun fact about the 'I, Tonya' title and shared some Will Smith gossip in a game of "Loaded Questions" on 'The Tonight Show Starring Jimmy Fallon.'

Margot Robbie discussed the "mouthful" title for her new Harley Quinn movie when she visited The Tonight Show on Monday.

The upcoming film is titled The Birds of Prey and the Fantabulous Emancipation of One Harley Quinn. "It's not a very serious movie, so we thought the title should reflect that. Birds of Prey makes it sound very serious and that's kind of like Harley adding her, like, 'Hey, don't worry. I'm in this too,'" she said.

"I love a long title," she continued. "I said that when we were thinking of the title. I was like, 'You know what? You know what's a great title?' Did you ever see The 100-Year-Old Man Who Climbed Out a Window and Disappeared? Long title, but I love it."

Fallon pointed out that her film I, Tonya could not have had a shorter title. "The writer wanted to call it I, Tonya because I think a marketing executive told him once that no title with a comma in it could ever be successful," she shared. "He was like, 'Well, f—k you. I'm gonna put a comma in the title.'"

She joked that host Jimmy Fallon should change the title of his talk show to "Jimmy, Fallon The Tonight Show."

Robbie also shared how she learned of her Academy Awards nomination in the best actress category for the film about Tonya Harding. "I really, really wanted to do a premiere in Australia to show my friends and family. I was really proud of the movie and was the producer on it," she said. "I was like, 'I really feel like I've done something good here' and I wanted them to see it."

She explained that she found out about her nomination during the Australian premiere. "Everyone flew in. We were going to have this amazing night," she recalled. "We were still partying — it must have been 1 a.m. or something — and they started announcing who got nominated in America and so someone had it up on their phone and we were at the afterparty and someone just plugged their iPhone in just in time and they were like, 'Yeah, and nominated' and they said, 'Margot Robbie.'"

"Everyone was just like, 'Ahh!' Everyone was crying," she said. "And we had already had the best night ever. It'd already been the most magical night. Everyone saw the movie and honestly nothing could have been better and then that happened and then I was like, 'This is just the best night of my life.'"

Robbie also joined Fallon in a game of "Loaded Questions" during her appearance.

The host explained that the players were each given two shots and a glass of beer. Each shot glass sat on a coaster with a personal question on it. The player would read the question silently and answer out loud. They then had to choose to take a shot or reveal what the question was to the audience.

The actress went first and took a moment to think about her answer after she read her question. "The answer to the question — I'm not proud of — but it would be, 'Also, I'm sorry to do this on Valentine's Day," she said.

"Did you break up with someone?" asked Fallon. After she nodded, the host responded, "Why on Valentine's Day? Why didn't you wait two days?"

"I was planning to and then the conversation arose and I couldn't avoid it and it happened and it was awful," she said. "I hope to God he's not watching this."

After Fallon read his question, he answered, "Howard Stern's house." Robbie said that she "so badly" wanted to know the question, though Fallon said, "You're never going to." He then took a shot.

Robbie turned to the next shot before she silently read her question. "I cannot reveal this question," she said. "I can tell you the answer, though, and the answer is Will Smith."

"Make of it what you will, Jimmy," she said before she took the shot.

Fallon shared that the answer to his next question was Michael Jordan. "I will tell you this one. 'Who is your worst kiss?'" he said was the question. "Let me tell you what happened. It wasn't that at all. Not Michael B. Jordan. No, Michael Jordan the basketball player. Legend."

He explained that the kiss took place at a charity golf tournament hosted by Derek Jeter. "At the end of the night they had some thing, like a dance thing afterward at a dance club," he said as he struggled to tell the story.  "He goes, 'Jimmy, do you know Michael?' And I go, 'No, I've never met him before' and I said hi to him. I went to give him a kiss on the cheek here and he went to give me a kiss on the other cheek and we both kissed each other."

"It happened very fast and I was so scared and he just grabbed me and goes, 'Don’t worry about this,'" he said.

For the final round, the two players answered the same question. Fallon explained that they would choose together if they would answer the question or drink a glass of beer together.

Fallon said "Kate Hudson" for his answer, while Robbie said, "I don’t have one." When Fallon asked her why she answered the way that she did, Robbie explained, "I have a rule and my rule prevents me from having an answer to that."

When Fallon went to start drinking the beer, Robbie told him to reveal the question. "It's not even a big deal, all right," he said before reading the question. "Do you have a co-star you thought you could've dated, but didn't?"

"We hung out and we were friends and I — this is a true, true story. I thought maybe, I don't know, maybe there could be something," he said about Hudson, who he appeared with in Almost Famous. "She's cool and we got along. We were super good friends."

He explained that the two met Hudson's ex-husband Chris Robinson while they were out one night together.

Hudson and Fallon then went ice skating together, though she left to go on a date with Robinson. "She ended up marrying Chris Robinson and having a baby," he said.