Instructions:

Found this one on a parenting board.

1 1/2 cups cold milk
1 (3.9 ounce) box instant chocolate pudding mix
1/4 to 1/2 cup peanut butter
15 whole graham crackers

In a mixing bowl, combine the milk, pudding mix, and peanut butter. Beat on low speed for 2 minutes. Let stand for 5 minutes. Break or cut graham crackers in half. Spread pudding mixture over half of the crackers. Top with remaining crackers. Wrap and freeze until firm. May be frozen for up to 1 month.