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Cast member Keira Knightley smiles as she is interviewed at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP)
PARK CITY, Utah—Director Lynn Shelton has a great idea for how to market her new film, "Laggies": put video of Keira Knightley dancing as a sign-spinner on YouTube.

Knightley demonstrates some sweet moves and deft sign-spinning skills in one of the opening scenes of the film, which premiered Friday at the Sundance Film Festival.

The actress plays Megan, a 28-year-old who feels directionless despite her graduate degree and stable, 12-year relationship. While her friends pursue careers, marriages and babies, Megan stands in front of her dad's tax office, dancing around with a sign that says "tax advice" in an attempt to drum up business.

"It makes me happy every time I see it," Shelton said, adding that she's sure video of Knightley's routine would "go viral" online.

Cast members Keira Knightley, right, and Chloe Grace Moretz, pose together at the premiere of the film "Laggies" during the 2014 Sundance Film
Cast members Keira Knightley, right, and Chloe Grace Moretz, pose together at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP) (Cast members Keira Knightley, right, and Chloe Grace Moretz, pose together at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP))

When Megan's boyfriend proposes, she panics. She befriends a teenage girl (Chloe Grace Moretz) and hides out at her house, where she's intrigued by the girl's single dad (Sam Rockwell).

Shelton, who has had three previous films at Sundance, said the cast was a dream. She said she called the best possible people for the role, and when they all said yes, it was "freaking awesome."

Knightley joked that the three stars had no chemistry.

"We all hated each other," she said. "So it was really, really good acting."

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Follow AP Entertainment Writer Sandy Cohen at http://www.twitter.com/APSandy.

Actor Sam Rockwell, right, kisses fellow cast member Chloe Grace Moretz, as they pose at the premiere of the film "Laggies" during the 2014
Actor Sam Rockwell, right, kisses fellow cast member Chloe Grace Moretz, as they pose at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP) (Actor Sam Rockwell, right, kisses fellow cast member Chloe Grace Moretz, as they pose at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP))

Actor Sam Rockwell hugs fellow cast member Chloe Grace Moretz, as Keira Knightley, right, stands with them at the premiere of the film "Laggies"
Actor Sam Rockwell hugs fellow cast member Chloe Grace Moretz, as Keira Knightley, right, stands with them at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP) (Actor Sam Rockwell hugs fellow cast member Chloe Grace Moretz, as Keira Knightley, right, stands with them at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014, in Park City, Utah. (Photo by Danny Mol)

Cast member Keira Knightley, left, and director Lynn Shelton pose together at the premiere of the film "Laggies" during the 2014 Sundance Film
Cast member Keira Knightley, left, and director Lynn Shelton pose together at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014 in Park City, Utah. (Photo by Danny Moloshok/Invision/AP) (Cast member Keira Knightley, left, and director Lynn Shelton pose together at the premiere of the film "Laggies" during the 2014 Sundance Film Festival, on Friday, Jan. 17, 2014 in Park City, Utah. (Photo by Danny Moloshok/Invision/AP))