Fully prepare lime gelatin per package instructions, including the recommended setting time (typically 4 hours).
When ready to mix drink, use a fork to break gelatin apart into small pieces (small enough to fit through a straw). Add shredded gelatin to a large pitcher of your choice (should be at least 1 liter or larger).
Add pineapple juice and vodka to pitcher, then stir.
Just before serving, pour in Sprite until pitcher is full. For best results, pour lemon-lime soda from a higher distance than you normally would so that there's extra fizz on top of the drink.
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