In a medium mixing bowl use a wooden spoon to stir the ice cream to soften. In each of four glasses layer cookie crumbs, softened ice cream, hot fudge topping and/or preserves, layering ingredients to the top of the glasses.
Top each trifle with whipped cream, banana slices, and more hot fudge topping and cookie crumbs. Cover and freeze up to 1 hour. Makes 4 servings.