Sundance Film Festival on Friday to an audience so eager to see if that even some ticketholders were unable to get a seat in the theater. The film stars Rose Byrne as Linda, a mother navigating a psychological breakdown while caring for her sick daughter.

What will surely go down as one the most stressful movies of the year is “If I Had Legs I’d Kick You,” which premiered Friday at the Sundance Film Festival.

From left, Conan O'Brien, Mary Bronstein and Rose Byrne attend the premiere of "If I Had Legs I'd Kick You" during the Sundance Film Festival on Friday at Library Theatre

Contrary to its title, everyone in If I Had Legs I’d Kick You has their appendages. Rose Byrne’s protagonist, however, does have a wealth of problems and neuroses, and writer/director Mary Bronstein dives into her headspace with a full-bore intensity and immediacy that’s bracing at first,

Creator Mary Bronstein and star Rose Byrne stop by THR's studio in Park City to dish all about their film If 'I Had Legs I'd Kick You.' They break down the meaning behind the movie, the difficulties of motherhood and more.