Whip heavy cream until stiff peaks are formed. Set aside. Place large chunks of coffee ice cream into a large punch bowl. Pour 1 quart of egg nog over the ice cream. Fold whipped cream into the egg nog-ice cream mixture. Pour in whiskey to taste starting with 1 cup and add as needed.

Punch should be frothy and thick. Serve in punch cups or small coffee cups. Add more cream and ice cream as needed.

Note- do not mix ingredients completely together- you want little tastes of cream, ice cream and eggnog throughout the mixture.