Blend the Base: In a blender, combine 1 cup of sweetened condensed milk with ½ cup of key lime juice. Blend on medium speed for about 30 seconds until smooth.

Mix in the Sherbet: In a mixing bowl, scoop out 2 cups of lime sherbet. Mix vigorously for about 1 minute until creamy.

Combine the Ingredients: Pour the blended mixture into the bowl with lime sherbet, folding it in gently for 1-2 minutes.

Add the Fizz: Slowly pour in 3 cups of Sprite or 7 Up while stirring gently for about 1 minute until frothy.

Create Spooky Colors: Add drops of food coloring to the mixture and stir gently for 30 seconds until vibrant.

Serve in Style: Pour into glasses, fill ¾ full, and garnish with gummy eyeballs or plastic spiders.

Add the Dramatic Effect: If desired, add small pieces of dry ice for a bubbling fog effect before serving.