Lime Sherbet Punch
["4 liters ginger ale", "2 liters 7-Up", "1/2 gal. lime sherbet (rectangular box)"]
["Ahead of time, cut 1/2 gallon sherbet into three sections and freeze separately.", "Freeze some ginger ale in a mold to create a solid ice ring to float in punch.", "(This keeps punch from being watered down from a regular ice ring.)"]
["liters ginger ale", "lime sherbet"]