Ben Affleck 'Could Be a Stand-Up Comedian,' Says Gone Girl Costar Rosamund Pike
09/27/2014 AT 03:55 PM EDT
A lesser-known talent?
"When we first were doing makeup tests I thought, 'This guy could be a standup comedian,' " says Affleck's Gone Girl costar Rosamund Pike. "He has characters and impersonations ... accents. He quickly crystallizes you."
The two star together as husband and wife in perhaps this fall's most anticipated film, director David Fincher's adaptation of author Gillian Flynn's best-selling novel about a marriage gone very wrong. The film opens Oct. 3.
"He's so good in the film. You watch this guy get tossed and turned," Pike, 35, says of Affleck, 42, who from the get-go has the finger pointed at him when his wife goes missing.
Offscreen, Affleck, who is married to Jennifer Garner, with three young children (Violet, 8½, Seraphina, 4, and Samuel, 2), reveals a different side.
"He's very fun," says Pike. "He's obviously got a son now, but you can feel he is surrounded by girls in his house."
"We would be in the makeup trailer and we very quickly got to talking about very gossipy female things and he just gets right stuck in it," she says with a laugh.
Pike herself is winning major buzz for her performance in the tricky, twisty role. "I had been craving the chance to play a lead," says the actress, whose past films include Die Another Day, Pride & Prejudice and An Education. Getting cast was "a giddy moment," she says, "followed by the anxiety of 'How am I going to pull this off?' "
For more on Gone Girl's breakout star Rosamund Pike, pick up this week's PEOPLE, on newsstands Friday