Pleasantville

Pleasantville is a movie starring Tobey Maguire, Jeff Daniels, and Joan Allen. Two 1990s teenage siblings find themselves in a 1950s sitcom, where their influence begins to profoundly change that complacent world.
Geeky teenager David and his popular twin sister, Jennifer, get sucked into the black-and-white world of a 1950s TV sitcom called "Pleasantville," and find a world where everything is peachy keen all the time. But when Jennifer's modern attitude disrupts Pleasantville's peaceful but boring routine, she literally brings color into its life.