Thaw the raspberries and combine them with the cranberry juice in a large bowl. Add 2 cups of the mixture to a saucepan and sprinkle with gelatin. Let stand for 2 minutes. Heat over low heat, stirring constantly, until gelatin dissolves. Add heated mixture back to the bowl with the remaining raspberry mixture. Prepare the hand by taking a vinyl glove (not latex, as this may cause an allergic reaction with some people) and turning it inside out. Wash and rinse thoroughly. Carefully pour the rasberry mixture into the glove. Tie it closed so it doesn't leak. Freeze until solid. The longer the better. When ready to serve, carefully cut the glove away from the frozen hand and place it in a large punch bowl. Add cider and ginger ale. For some extra spookiness, garnish with gummi worms if desired.