To a large bowl, add the graham cracker crumbs, sugar and butter. Stir to combine, and then press into the bottom and up the sides of a 9-inch pie plate. Place the graham cracker crust in the freezer while you prepare the filling.
PREPARE THE FILLING:
In a large bowl, stir together the milk and lemon juice. Fold in the berries, and then fold in the whipped topping. Spoon the mixture into the frozen crust. Return the pie to the freezer, and freeze for at least 5 hours. Let it stand for 30 to 40 minutes before serving. Garnish as desired. Leftovers go in the freezer.