Special equipment: a 1 1/2-gallon fish bowl; non-toxic aquarium plants; 12 plastic sharks
For the punch: Combine the lemonade, rum and curacao in a large pitcher and refrigerate until chilled, at least 2 hours.
For the decorations: Thoroughly wash and dry a 1 1/2-gallon fish bowl, some non-toxic aquarium plants and 12 plastic sharks.
Rinse the rock candy with cold water, put it in a large resealable plastic bag and lightly crush with a meat mallet to make gravel. Pour the gravel into the fish bowl and add the aquarium plants, anchoring them with the gravel. Arrange some gummy sea creatures on top of the gravel. Freeze the bowl while the punch chills, at least 2 hours.
To serve, gently pour the rum mixture into the fish bowl, taking care not to disturb the plants, followed by the seltzer. Put a gummy fish in the bottom of each glass and ladle in punch. Pour about 1/2 teaspoon grenadine into the mouth of each plastic shark. Have your guests dive their sharks headfirst into their glasses in mock attack.
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