The parent trap (1961)

Hayley Mills, Special Academy Award winner for 1960's Pollyanna, lights up the screen in Disney's fondly remembered release of The Parent Trap. Mills stars as Susan and Sharon, identical twins separated at birth. Neither twin knows the other exists until a simple twist of fate finds them at the same summer camp. Then, realizing who they are, they plan a little twist of their own. They switch places with high hopes of getting their parents back together.