Place in a scary bowl or cauldron vanilla ice cream and orange sherbet. Sprinkle enough dry gelatin mix to cover ice cream (add more gelatin if you like a lot of flavor). Pour in the 7-up or Sierra Mist (it will be really foamy). Sprinkle some more gelatin on top as desired. Top it off with a few gummy worms and place a few hanging over the sides of the bowl. Garnish each glass with a gummy worm before serving. Recipe can also be altered, if you do not like orange. I have also made lime. Just substitute lime sherbet for the orange sherbet, and lime gelatin for the orange.