Zack Sharf Ryan Gosling said on “The Tonight Show” that Greta Gerwig and Noah Baumbach’s “Barbie” screenplay is “the best script I’ve ever read,” but that’s not what made him finally agree to Gerwig’s offer to star in the movie as Ken. It turns out the universe gave Gosling a bit of a push, as the actor discovered one of his daughter’s Ken dolls face down in the dirt almost immediately after being offered the “Barbie” movie.“Best script I’ve ever read. I walk out in the backyard [after getting the offer] and, do you know where I found Ken?” Gosling said.