Place remaining 3/4 of chocolate in a small saucepan with 3 tablespoons butter or margarine. Melt over low heat, stirring frequently, until smooth.
Place crisp rice cereal in a medium mixing bowl.
Pour chocolate mixture over cereal, and stir gently to coat. Using the back of a spoon, press mixture onto bottom and sides of greased pie pan.
Place crust in freezer just until firm, about 5 to 10 minutes.
Place remaining 1/4 of chopped chocolate and 2 tablespoons of butter or margarine in a small saucepan. Melt over low heat, stirring frequently, until smooth. Cool slightly.
Remove crust from freezer and arrange scoops of vanilla, mint chocolate chip, and strawberry ice cream in it.
Drizzle chocolate mixture over top and serve immediately.