10 Real Reasons These Actors Were Cast In Major Movie Roles

10. Ben Affleck Had The Same Smile In Every Paparazzi Photo - Gone Girl

It's no secret that David Fincher is incredibly particular about the casting of his movies, and after he teased a killer performance out of Justin Timberlake in The Social Network, there was no reason to ever doubt him.

Ben Affleck was cast in the lead role of Nick Dunne for Fincher's 2014 thriller Gone Girl, playing a husband whose wife (Rosamund Pike) disappears, causing him to become the prime suspect.

Fincher didn't merely cast Affleck for his star profile, though, but because of one specific reason - his smile.

Fincher sought out actors for the part by scouring Google, and noticed a peculiarity about the way the actor smiled in paparazzi pictures which made him perfect for Gone Girl's unforgettable press conference scene, where Nick smiles for the cameras and is endlessly pilloried by the media for it. Fincher said:

"You cast movies based on critical scenes. In Gone Girl there's a smile the guy has to give when the local press asks him to stand next to a poster of his missing wife. I flipped through Google Images and found about 50 shots of Affleck giving that kind of smile in public situations. You look at them and know he's trying to make people comfortable in the moment, but by doing that he's making himself vulnerable to people having other perceptions about him."

Affleck's million-dollar smile has probably won him countless roles over the years, but never in a way quite like this.