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Witch's Wicked Punch -- Mix two liters lemon-lime seltzer and 1-1/2 quarts lime sherbet. Spoon 1-1/2 quarts sherbet in scoops on top. Pour 2 liters of lemon-lime seltzer over. This will make it foam. If you want to make it very spooky, you can spray the foam with black food coloring.