Chill all your ingredients well — a cold punch stays fizzy and frosty much longer.
In a large punch bowl or drink dispenser, pour in the pineapple juice.
Add a few drops of green food coloring and stir — start with 3 to 4 drops and add more until you get that perfect witchy green.
Just before serving, pour in the chilled lemon-lime soda. Stir gently to keep the fizz.
Add big scoops of lime sherbet — they'll float, foam, and slowly melt into the punch, creating that magical bubbling "brew" effect.
Add ice cubes and any spooky extras: drape gummy worms over the rim of glasses, or drop in gummy eyeballs.
Ladle into cups and serve immediately while it's fizzy and frothy.