Boil 3 cups of water in a large bowl in the microwave or on the stovetop.
Add the package of Jello and unflavored gelatin and mix together until completely dissolved. Add in heavy whipping cream and mix together.
Add in green food coloring (plus red, optional) and mix together to get the color of worms.
Pull all of the bendy straws out so the flexible parts are completely expanded. Make sure all the straws are facing the same way and place a rubber band around them.
Place the straws in the wide mouth cup or jar with the bendy sides down at the bottom of the glass.
Pour the gelatin mixture into a glass measuring cup with spout for easy pouring.
Pour the mixture over top of the straws until the container fills up.
Place in fridge and chill for about 4 hours.
Pull straws out of container and remove the excess Jello around the outside of the straws.
Lay a piece of parchment paper down on a cookie sheet.
Remove the Jello worms by pinching the top of the straw and slide your fingers down till the Jello is out of the straw. Place on the parchment paper. Repeat until all straws are empty.
The worms will be two different colors from the whipping cream separate during chill time.
Place in fridge until ready to serve. Serve alone or with dirt pudding, Jello brain, cupcakes and more.